This is an intressting way of categorizing content creation software:
Compositors
(applications that export data that is intended for the end-user)
- Image compositor, exports PNG, JPEG etc. (this is Leonardo)
- Video compositor, exports AVI, MPEG etc.
- Document compositor, exports PDF.
- Code compositor, exports EXE.
Collectors
(applications that collect data from the outside world)
- Image collector, imports RAW etc.
- Video collector, imports R3D etc.
Coadjutors
(applications that export data that is not intended for the end-user but rather to be imported by some compositor)
- Surface modeler, exports OBJ etc.
- Voxel modeler, export OBJ with corresponding textures (this is Michelangelo).
- Texture painting, export textures.
- Model animation, exports OBJs etc.
- 2D vector graphic editor, exports SVG etc.
- Spreadsheet editor, exports XML.
(this list is incomplete)