The Telegram API and TDLib allow you to build your own customized Telegram clients. You are welcome to use both APIs free of charge.
Telegram Bot API
The Bot API is an HTTP-based interface created for developers keen on building bots for Telegram.
Introduction to the Telegram API. Analyse... | Towards Data Science
The more well-known of Telegram's APIs is its Bot API, a HTTP-based API for developers to Besides the Bot API, there's also the Telegram API itself. This is the API used by Telegram apps for...
Getting Started - Go Telegram Bot API
This library is designed as a simple wrapper around the Telegram Bot API. It's encouraged to read Telegram's docs first to get an understanding of what Bots are capable of doing.
telegram-api :: Stackage Server
High-level bindings to the Telegram Bot API based on servant library. Both getUpdates request or webhook can be used to receive updates for your bot. Inline mode is supported.
Getting Started | Telegram Bot API PHP SDK
Telegram Bot API is an HTTP-based interface created for developers keen on building bots for Telegram. To learn more about the Telegram Bot API, please consult the Introduction to Bots and...
pyTelegramBotAPI · PyPI | General use of the API
April 9,2016 Telegram release new bot 2.0 API, which has a drastic revision especially for the change of method's interface.If you want to Telegram Bot API support new type Chat for message.chat.