~5800 stars; complements python-telegram-bot, Telethon; Official Bot API framework (FSM, middleware, magic filters).
Yes, aiogram is open source under the MIT license.
aiogram is free to use.
Yes, aiogram can be self-hosted (the source is available under the MIT license).
~5800 stars; complements python-telegram-bot, Telethon; Official Bot API framework (FSM, middleware, magic filters). Auth via bot token. No ToS risk. Complementary alt to python-telegram-bot.