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.

Photoshop is a professional image editor and the de-facto industry standard. It supports layers, non-destructive-editing, vector graphics and color management and plugIns.

Feedly is a better way to organize, read and share the content of your favorite sites.

Picasa is a software download from Google, that helps you organize, edit, and share your photos. The local application usage and the online storage up to 1 GB is free, and it is easy to use. The online version is called Picasa Web Albums.

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.

Paint.NET is a free image and photo editing software. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools.

Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License.

JDownloader simplifies and improves the process of downloading files from "free" file hosting sites like Rapidshare or Megaupload.

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful. .

Fast and compact image viewer/converter trying to be simple for beginners and powerful for professionals. Many supported file formats and features.

DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser.

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.

Greenshot is a light-weight screenshot tool optimized for productivity with Optical Character Recognition (OCR) support.

FreezeCrowd is a social network that connects people in group photos. The motto is to break the ice and connect with your friends through the photos.

All-in-one voice, video and text chat for gamers that’s free, secure, and works on both your desktop and phone.

Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs.

SketchUp (formerly Google Sketchup) is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, civil and mechanical engineering, film, and video game design—and available in a...

XnView is a utility for viewing and converting graphic files. XnView is provided as FREEWARE for private non-commercial or educational use (including non-profit organization).

FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.

Online social photo and short video sharing community. Flickr helps you organize that huge mass of photos you have and offers a way for you, your friends and family to tell stories about them.

Micro-blogging. Tumblr lets you effortlessly share anything. Post text, photos, quotes, links, music, and videos, from your browser, phone, desktop, email, or wherever you happen to be.

Pixelmator is a powerful, beautiful, and easy to use image editor. Featuring an elegant and streamlined single-window interface, it puts all the focus on the images you edit, rather than what's around them.

Design quickly and confidently with Adobe Illustrator software. Sophisticated tools for drawing and typography, along with advanced color controls and creative effects, provide a comprehensive vector graphics environment.

Adobe Photoshop Lightroom CC is a commercial photo processor and image organizer.

Pencil is a standalone app or Firefox extension that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.