Multimedia

Computer Screen Capture

Shutter: Image Screen Capture Tool for Linux

Greenshot: Image Screen Capture Tool for Windows

RecordMyDesktop: Video Capture Tool for Linux

Audio and Video

Audacity: Audio Recorder and Editor

Cinelerra: Video Editor and Compositor

Electronics Design

KiCAD: Electronic Schematic and PCB Layout Design Suite

Visolate: Circuit Board Toolpath Generator

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

http://opensourceecology.org/wiki/Multimedia/Mathematics

Graphics

http://opensourceecology.org/wiki/Multimedia/Graphics

Text and Presentation

http://opensourceecology.org/wiki/Multimedia/Text_Presentation