Ah yes, the photos are very dark, but i see CB-Emu in the titlebar on some of the photos.

- CB-Emu (old version) is derived from an older MAME/MESS version before MAME went open-source license. The old MAME license forbids you to sell it.
- MessExtra and MessChess are technically GPL2+
- external artwork and Franz's plugins are unknown license (the plugins by Sandro are all BSD3 open source)