The Natron version number (eg 2.3.15) appears in:

- Documentation/source/conf.py in variables version and release
- App/App.pro in variable VERSION
- Natron.spec in variable Version
- Global/Macros.h in variables NATRON_VERSION_MAJOR NATRON_VERSION_MINOR NATRON_VERSION_REVISION
- This file!

Documentation/source/index.rst also contains links to the versioned documentation on readthedocs (currently rb-2.3)