Huntathon - Browse and submit Product Hunt Global Hackathon projects
Y Combinator Co-founder Matching - YC’s free online platform to help you find your co-founder
Foundler - Online hackathon weekends. Attend every other week.
Findnlink - Find people to work with on your ideas.
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.
Founders Nation - Find or become a startup cofounder