• Friends of Figma 🌎 (you can join the general internationnal one, then there's local communities in big cities)
• DesignX 🌎 (international, originaly from Canada)
• The Designership 🌎 (international, created by Misko)
• Design buddies 🌎 (international, haven’t been using is but they look like they have a lot of nice resources, including a job board on their website)
• Contra 🌎 (about freelancing, internationnal, originaly from the US)
• Design Ops Assembly 🌎 (worldwide design ops community)
• Ideate Labs 🇺🇸 (6000+ designers, Ideate Labs is a bootcamp school on a mission to make design accessible to minorities)
• Rita Lab 🇺🇸 (Led by Miguel Makes, this community’s mission is to make tech and design more diversed and inclusive. They organize free events and paid seminars)
• Crème de la crème 🇫🇷 (they a freelance platform, you need to join the platform to get access to the Slack, French)
• French Designers Club 🇫🇷 (about design UX/UI, international but for French speakers)
• Flupa 🇫🇷 (about design UX, international but for French speakers)
• The Cacatoes Theory 🇫🇷 (about design UI, French)
• Montreal Interactive 🇨🇦 (about design UX/UI, Montreal, French speaking)
• Tout le Monde UX 🇨🇦 (about design UX, Montreal, French speaking)
• UX writers 🇨🇦 (about UX Writing, Montreal, French speaking)
• UX Rescue - added to the list by Karoline mess (A volunteer-based platform that connects UX practitioners to organizations in need across the globe. You can sign up there as a volunteer to work on interesting projects, which you can also later on use in your portfolio. There is also a chance to get involved as a mentor & they have a slack community)

Want to add one to the list ? Add a comment here :)