Foundler - Online hackathon weekends. Attend every other week.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.
HackHub - Host tech events and hackathons with ease 👨💻🛠
Makerbase - Like a user-editable IMDB for product makers
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.
PipeCandy Insights Platform - 50+ business insights about eCommerce companies that matter!