Multimedia

Computer Screen Capture

Shutter: Image Screen Capture Tool for Linux

Greenshot: Image Screen Capture Tool for Windows

RecordMyDesktop: Video Capture Tool for Linux

Graphics, Audio, Video

Inkscape: Vector Graphics Editor

Audacity: Audio Recorder and Editor

Cinelerra: Video Editor and Compositor

Electronics Design

KiCAD: Electronic Schematic and PCB Layout Design Suite

3D Model Design

Solidworks: 3D Parametric Modeler, Integrated 2D Drawer, Assembler and Analyzer

Dxf2Gcode: Converter of dxf files to gcode files

PyCAM: Toolpath Generator for 3 Axis Machining

Mathematics

Sage

Text and Presentation

Libreoffice: Office Suite

http://www.libreoffice.org/

Google Documents: Online Office Suite and Repository

https://drive.google.com/?pli=1#

Google Doc Embedder

http://www.davistribe.org/gde/