Do you really trust one off them for your privat chats?
Did you review the code? Do you know the developers?
Links:
https://github.com/NekoX-Dev/NekoX
https://github.com/AyuGram/AyuGram4A
https://github.com/Forkgram/TelegramAndroid
https://github.com/Telegram-FOSS-Team/Telegram-FOSS
https://github.com/nikitasius/Telegraher
https://github.com/exteraSquad/exteraGram
https://github.com/OwlGramDev/OwlGram
