LibreCAD
LibreCAD is based on QCAD but provides a more modern interface.
Arhive
QCAD
QCAD and LibreCAD are a cross-platform 2D CAD packages.
Blender
As well as animation, Blender can be used for 3D modelling. Models created in Blender can be used for 3D printing.
Scribus
Scribus is a cross-platform Desktop Publishing application. As well as typesetting, a range of standard image formats are supported, as are Adobe Photoshop and Illustrator […]
Inkscape
Inkscape is a cross-platform program for creating vector graphics, based on the standard SVG format. Importing and exporting of bitmap graphics formats is supported, as […]
UFRaw
Photography workflow and RAW processing tools.
Darktable
Photography workflow and RAW processing tools
The GIMP
The GIMP (GNU Image Manipulation Program) provides a complete set of tools for editing bitmaps, including layering, effects, and colour tools. Plug-ins and scripts are […]
Fountain
Fountain is a plain-text format which can be used for screen writing and rendered to a formatted screenplay.
Celtx
Celtx is a fully-featured crossplatform screen-writing application. Celtx can sync with cloud services and mobile apps, although these are not open source.