GG Messenger - Free Instant Messaging app, on the phone, on your computer or log in to the browser. Great text messenger for small businesses and to meet new people.
they've stated that with the new version they're trying to be a Slack replacement, there's going to be an AI assistant built in, and the free tier will only let you contact 25 people.
it's never been end-to-end encrypted, either, and I don't think this rewrite is going to be.
oh, and your account gets its unique number, that you need to give away to people in order to contact them, which limits the discoverability among your phone contacts, which you get with Whatsapp or Signal. it basically used to be Poland's local ICQ equivalent. and its default message sound was supreme
GG is around for over 25 years AFAIK :) It was dominant communicator used in Poland before Google and Facebook came. Those were different times and GG was most probably owned by someone else, it was also called GaduGadu.