Limzo
I'm building Limzo (https://limzo.com), a free anti-spam and moderation bot for Telegram groups. About 750 groups tried it in 11 weeks and 353 still have it. The interesting problem right now: about half of all removals happen in the first hour, mostly in tiny groups of friends, and I still don't fully know what they expected from it. On the side: Totemancer (https://totemancer.com), a turn-based territory game on Telegram with a hand-written game AI.