Instant messaging

Matrix.to (Matrix.org)

Matrix.to is a web tool that allows users to create shareable links to Matrix chat rooms, making it easier for people to join conversations on the Matrix network.

Gadu-Gadu

Gadu-Gadu is a Polish instant messaging service that allows users to communicate with each other through text messages, voice calls, and video calls. It is popular in Poland and offers various features for users to stay connected with friends and family.

ICQ

ICQ is a messaging app that allows users to communicate with friends and family through text, voice, and video chat. It also offers features such as stickers, games, and file sharing.