For Windows

Mozilla Firefox (known simply as Firefox) is a free and open source web browser descended from the Mozilla Application Suite. Firefox is highly extensible, with thousands of third-party add-ons available.

Firefox version 60+ (Quantum) is presently faster than Google Chrome and use less memory than Chrome. Compare to previous versions of Firefox, the Quantum version is twice as fast, promote parallelism, and has more intuitive user interface.
• Video at https://youtu.be/n6wiRyKkmKc
• Read more and see performance test results at https://blog.mozilla.org/firefox/quantum-performance-test/

Firefox is developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation

KeePass is a free open source password manager, which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key file. So you only have to remember one single master password or select the key file to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish).
Also portable app: http://portableapps.com/apps/utilities/keepass_portable .

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

It supports POP (storing mail locally on your hard drive so that it can be accessed without an internet connection), and IMAP. It features excellent mail filter capabilities and management.

Thunderbird has strong support for using multiple accounts and identities, including automated signature features.

Chat functionality is built in, so you can enjoy real-time conversation with your contacts, right from your favorite messaging application, with multiple supported networks. Thunderbird makes it easy to search through both past conversations and received emails.

Thunderbird can also function as an RSS/Atom feed reader, and has a large selection of add-ons that extend it with calendar support, PGP support, integration with online services and much more.

Available also as portable app: http://portableapps.com/apps/internet/thunderbird_portable

A command-line installer for Windows.

"Everything" is an administrative tool that locates files and folders by filename instantly for Windows. Unlike Windows search "Everything" initially displays every file and folder on local or removable NTFS volumes on your computer (hence the name "Everything"), and on mapped network drives with ETP server and an everything installation too. You type in a search filter to limit what files and folders are displayed. 19 languages supported.

How can "Everything" index a mapped network drive?
To search a networked computer you will need to run Everything on both computers.
One computer will need to Start an ETP server.
The other computer will need to connect to that ETP server.

To start an ETP server:

1. In Everything, On the Tools menu, click Start ETP server.

To connect to an ETP server:

1. In Everything, On the Tools menu, click Connect to ETP Server....
2. Type in the ETP server name.
3. Type in the ETP server port.
4. Type in the ETP server user.
5. Type in the ETP server password.
6. Click OK.

Software that makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.

The main features of 7-Zip

High compression ratio in 7z format with LZMA and LZMA2 compression
Supported formats:
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z.
For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip
Strong AES-256 encryption in 7z and ZIP formats
Self-extracting capability for 7z format
Integration with Windows Shell
Powerful File Manager
Powerful command line version
Plugin for FAR Manager
Localizations for 87 languages

7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2012 / 2008 / 2003 / 2000 / NT. There is a port of the command line version to Linux/Unix.

AutoHotkey is a free, open-source scripting language for Windows that allows users to easily create small to complex scripts for all kinds of tasks such as: form fillers, auto-clicking, macros, etc.

Popular and efficient blocker for Chromium, Chrome, Edge, Firefox (desktop and Android), Opera, Safari, Thunderbird. Fast and lean.

WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.

Sumatra PDF is a slim, free, open-source PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Why another PDF reader?

Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features.

Its small and starts up very fast.

Its designed for portable use: its just one file with no external dependencies so you can easily run it from external USB drive.

Freeware Winamp-like media player, based on BASS audio library with support for large number of formats and playlists. It works with multiple playlists immediately (tabbed window), allows creation of bookmarks and also has a playback queue. Crystal-clear sound, technology of reproduction essentially differs from Winamp and WMP.
A maximum of functionality from a minimum of resources.
The minimal consumption of system resources, lighter than Winamp
Multilingual support.
Adjustment of global and local hot keys (patterns from WinAmp and WMP).
Support of plug-ins, skins and custom icons.
Cue-Sheets and Last.fm built-in support.

Spotify is a commercial music streaming service providing digital rights management-restricted content from record labels including Sony, EMI, Warner Music Group and Universal.

Music can be browsed by artist, album, genre, playlist, or record label, as well as by direct searches. On computers, a link allows the listener to purchase selected material via partner retailers.

Spotify music streaming is available on all Android and iOS devices and on desktop computers for unlimited durations. Features like offline listening and ad-free playback are only available for Premium subscribers of the service.

Lyrics plugin software for iTunes, Windows Media Player, Winamp, etc. You do not need to change the way you enjoy music. Display scrolling lyrics, you can follow along with the artist and catch every word. Automatically search and download lyrics. Huge lyrics database, and it is expanding everyday. Compatibility with 21 players. Nag-banner in free version

An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more. We also aim to maintain a thriving user and developer community by using open, community-oriented development.

GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.

Krita is a complete creative sketching and painting application with advanced, commercial quality features. It's free, open-source and available across all major desktop platforms.

User Interface - An intuitive user interface that stays out of your way. The dockers and panels can be moved and customized for your specific workflow. Once you have your setup, you can save it as your own workspace. You can also create your own shortcuts for commonly used tools.

Pop-up Palette - Quickly pick your color and brush by right-clicking on the canvas.

Brush Stabilizers - Have a shaky hand? Add a stabilizer to your brush to smoothen it out.

Brush Engines - Customize your brushes with 9 unique brush engines.

Wrap-around mode - It is easy to create seamless textures and patterns now. Press the ‘W’ key while painting to toggle wrap-around mode.

Resource Manager - Import brush and texture packs from other artists to expand your tool set.

Layer Management - Krita comes with vector, filter, group, and file layers. Combine, order, and flatten layers to keep organized. Add drop shadows and other simple effects using visual styles.

Full Color Management - Krita supports full color management through LCMS for ICC and OpenColor IO for EXR, allowing you to incorporate Krita into your existing color management pipeline.

MPC-HC is an extremely light-weight, open source media player for Windows. It supports all common video and audio file formats available for playback.

The tool was developed by mpc-hc.org until July 2017, when it announced its last release due to lack of active developers. The project has been forked by one of the former co-devs, clsid2, that continued the development with new releases since early 2018.

Lightweight
Watch movies on any SSE2 CPU, even on your old computer back from 2000.

Customizable
With its wide array of options, MPC-HC can be customized to fit almost any needs. Among other things, we added custom toolbars.

All around player
MPC-HC can also be used as DVB player.

HandBrake is an open-source, multithreaded video transcoder: it converts and compress digital media from one format to another.

Calibre is a free and open source e-book library management application made by users, for users. Many languages, designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.

Calibre can sort the books in your library by title, author, date added, date published, size, rating, or series, along with extra metadata such as tags and personal comments. You can easily search your book collection for a particular book, based on any of this information. Calibre can also go onto the internet to find online books based on existing title/author or ISBN information.

In addition, Calibre also:
-syncs to your ebook reader
-downloads news from the internet and converts it into ebook form
-offers a ebook viewer that can display all major ebook formats

Features:

Library Management
E-book conversion
Syncing to e-book reader devices
Downloading news from the web and converting it into e-book form
Built-in e-book viewer
Content server for online access to your book collection
E-book editor for the major e-book formats

Picard is the next generation MusicBrainz tagging application. This new tagging concept is album oriented, as opposed to track/file oriented like the ClassicTagger was. Picard is written in Python, which is a cross-platform language, and makes use of cross-platform libraries - this allows the same code to run both on Windows, Linux and Mac OS X.

JDownloader simplifies and improves the process of downloading files from sites like YouTube or Mega.
JDownloader offers downloading in multiple parallel streams, CAPTCHA recognition, and automatic file extraction. It support CCF, RSDF and DLC files.

Python and Django IDE with refactorings, code completion, on-the-fly code analysis and other features, including version control integration, deployment, integration with issue trackers, and remote debugging.
There is also an open source version, PyCharm Community Edition, which has some limitations: it does not support database/SQL, UML diagrams, code coverage, CSS and JavaScript.

Enjoy productive PHP and web development with PhpStorm.
Take advantage of deep code understanding, top-notch coding assistance, and support for all major tools and frameworks.

Code combines the streamlined UI of a modern editor with rich code assistance and navigation, and an integrated debugging experience – without the need for a full IDE.

Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.

Wireshark has a rich feature set which includes the following:

-Deep inspection of hundreds of protocols, with more being added all the time
-Live capture and offline analysis
-Standard three-pane packet browser
-Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others
-Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility
-The most powerful display filters in the industry
-Rich VoIP analysis
-Read/write many different capture file formats: tcpdump (libpcap), Pcap NG, Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, NetScreen snoop, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others
-Capture files compressed with gzip can be decompressed on the fly
-Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platform)
-Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2
-Coloring rules can be applied to the packet list for quick, intuitive analysis
-Output can be exported to XML, PostScript®, CSV, or plain text

A free, open-source Integrated Development Environment for software developers. You get all the tools you need to create professional desktop, enterprise, web, and mobile applications with the Java language, C/C++, and even dynamic languages such as PHP, JavaScript, Groovy, and Ruby. NetBeans IDE is easy to install and use straight out of the box and runs on many platforms including Windows, Linux, Mac OS X and Solaris.
The download section conveniently offers prepackaged bundles/installers for each supported programming language containing only required plugins.

HeidiSQL is a useful tool designed for web developers using the popular MySQL server, Microsoft SQL databases and PostgreSQL. It enables you to browse and edit data, create and edit tables, views, procedures, triggers and scheduled events. Also, you can export structure and data either to SQL file, clipboard or to other servers.