You'll have to find that out, indeed, not something we can help you with. But there is a lot of old junk floating around.
Unfortunately, "the scene" is full of ego trippers who refuse to publish their code, but distribute ipk's instead. That means we can't build and provide users with the latest version, nobody can contribute fixes or help with py3 conversions, and users have to spend loads of this searching the web for new versions.
Once you have those ipk's, you can copy them into the backup directory (you can make an autobackup from the menu, a lot of people do this automatically, on a daily basis) and they will be restored too.
Currently in use: VU+ Duo 4K (2xFBC S2), VU+ Solo 4K (1xFBC S2), uClan Usytm 4K Ultimate (S2+T2), Octagon SF8008 (S2+T2), Zgemma H9.2H (S2+T2)
Due to my bad health, I will not be very active at times and may be slow to respond. I will not read the forum or PM on a regular basis.
Many answers to your question can be found in our new and improved wiki.