Foundler - Online hackathon weekends. Attend every other week.
PenPal World - Connect with people all over the world
HackHub - Host tech events and hackathons with ease 👨💻🛠
InterPals - InterPals is a friendly community of over 5 million friends, language learners, travelers and penpals.
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.
Polyglot Club - Polyglot Club is a new social network for language learners.