Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.

Miranda NG: Next Generation of Miranda IM

Bot API for Python

Golang library for Bot API

Open-source instant messaging server that makes classic AIM and ICQ clients work again.

Set of PHP tools for simple and clear work with ICQ(OSCAR) protocol

🍊 Android mobile IM client

Ace IM internet messenger (Android)

Асинхронная библиотека Python для bot API

PHP ICQ bot api

🐳 BitlBee on Alpine Edge with Plugins Docker Container

ICQ New Bot SDK for Node.js

The plugin allows to send Jenkins notifications to ICQ

Kotlin core interface to ICQ Bot API

Own desktop (and applet) IM, similar to ICQ, in Java. Uses Swing.

ICQ protocol implementation for libpurple. Written in Rust.

Unified .NET API for MSN, Yahoo, ICQ, AIM, and Jabber/GTalk.

Бот мотиватор с подпиской на уведомления. Кнопки, подписка, работа с картинками.