Telegram X, official alternative Telegram client for Android, a slick experimental Telegram client based on TDLib:

• https://github.com/TGX-Android/Telegram-X

• https://play.google.com/store/apps/details?id=org.thunderdog.challegram

• Developers Community group: https://t.me/tgx_dev

• APKs & Build Info channel: https://t.me/tgx_log