All Telegram Developers have released source code of the latest app versions!
@tgbeta- Source Code of Telegram X 0.20.6.906 Android
- Source Code of Telegram X 5.0.2 iOS
- Source Code of Telegram 4.8.5 Android
- Source Code of Telegram 4.8.1 iOS
- Source Code of Telegram 3.0 Windows Phone
- Source Code of Telegram macOS 3.8.2
- Source Code of Telegram Desktop 1.2.15
- Source Code of Telegram Web (Webogram) 0.7.0