Scrum Study Cards - An easy to understand overview of the Scrum framework.
Huntathon - Browse and submit Product Hunt Global Hackathon projects
Lavagna - OpenSource project management tool designed for small teams.
Foundler - Online hackathon weekends. Attend every other week.
Ora - Welcome to your team’s command center. A place to track projects. Tasks. Time. Commits. Status Reports. Your entire product or business! It's the fastest-growing productivity suite your team needs right now!
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.