There are many repositories of privacy tools, but none of them makes it easy to find forks, for example if I want to know the existence of a fork for Telegram, I don't know where I can look for it or how to do it, not even AI is good for it.
Luckily I know Forkgram (although only available for Android), but the Telegram fork is just one example.
If anyone knows about any fork discovery repositories, I would greatly appreciate it if you could show me. Thanks u!

Private forks of Telegram don't exist because Telegram is an inherently unprivate service. I'm guessing the same is true of the other apps you're looking for.

https://atomicshrimp.com/post/2013/11/01/The-Museum-Of-Disposable-Forks

Like an aggregator for alternatives, or a standard in DCVS to publish forks? Github has a proprietary fork demonstrator, gitlab, gitea, [radicle](https://radicle.dev/faq, ectc..

Where it comes to privacy and security sometimes you just have to be there. I'm aware there was a situation surrounding VeraCrypt and TrueCrypt, but I don't know which one is the one to use going forward if either of them are.

LibreSSL and OpenSSL and how all that came to be is a good read as well.