Open/Free soft must have

Spek helps to analyse your audio files by showing their spectrogram. Spek is free software available for Unix, Windows and Mac OS X.

Free open-source multi-track audio editor and recorder with 32-bit float processing. Supports many formats and plugins for Windows, macOS, Linux.

This is a tool to analyze media files. It can give you information about the audio and video format, video resolution, duration, etc.

ASIO4ALL is a hardware independent low latency ASIO driver for WDM audio devices. It uses WDM (Windows Driver Model) Kernel-Streaming and sometimes even more sophisticated methods to achieve its objectives.

This is the best antivirus toolkit. (Warning! unfortunately, only in Russian)

Fullscreen word processor

Application for running Windows software on operating systems that are normally not supported.

Create bootable USB flash drives (cross-platform)

Programming language

Native Git client

Create bootable USB flash drives

Messaging app

Arduino IDE

Text editor for code

Dark-Net

Autoruns shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them

Winamp-like media player

Tool for testing and formatting flash-drives

DOS-emulator

Remote connections manager

Podcast management

Terminal based IRC client

Network protocol analyzer

SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security

Broadband speed analysis tool

Unix-like environment and command-line interface for Microsoft Windows

Details on CPU, RAM, real-time stats

Scans computer to find settings that may have been changed by spyware, malware or other unwanted programs.

File-unlocker. Be careful Bundleware! (Uncheck a task checkbox at setup initialisation)

3D creation suite

Efficient tool for measuring HDD and SSD performance through sequential and random read/write speed tests, featuring a user-friendly interface.

Remote connections manager

ePub e-book editor

HDD/SSD utility

Tools to create, alter and inspect MKV files

Network mapper

Prototyping circuits

Java-based home automation platform

Game engine

IRC Chat client

Hardware information

Differencing and merging tool

Tool for writers

Programming IDE

Peer-to-peer file sharing

E-book library management

Electronic circuit simulator

Virtualization

Mind Mapping

File manager