NINA's Website
This is not a new project and I have been following them for a long time now. They collaborate with https://escargot.chat/, a MSN Messenger revival and show a lot of good progress in their private donator's only channel in their Discord. For anyone curious about the protocols of AIM, MSN or Yahoo Messenger their wiki is massive and filled with information.
https://wiki.nina.chat/wiki/Main_Page
They're also now in private alpha. AIM from the earliest versions up to 5.9 work. To get access, simply donate here https://nina.chat/donate. ICQ and AOL Desktop are next on the roadmap but this is a huge win. The developers have lots of exciting stuff coming and I hope it could peek the interest of some of you folks here.
Screenshot is just your standard XP SP3, not a Beta build, i just like watercolor lol. In theory, any operating system capable on running AIM should work. I helped them get Kopete's AIM plugin working and Pidgin 2.14.2's before they had removed it, which are both good applications for Linux, and I even saw someone use it on AIM 1.6 with Windows 3.11 for Workgroups.