LekkerIM is a free, open-source instant messaging client for Windows, Linux, and macOS operating systems. It was created as an alternative to commercial IM clients like Skype or WhatsApp with a strong focus on user privacy and security.
Some of the standout features of LekkerIM include:
Overall, if you're looking for a highly flexible, privacy-focused alternative to the mainstream IM clients, give the open source LekkerIM a try!