Developer Circles Community Challenge

Using at least one Facebook technology, create a solution for developers that either 1) improves their coding skills, 2) makes them more productive coders, or 3) fosters community with other developers. Over a dozen prizes worth more than $150,000 will be awarded, including three $5,000 student team awards.

• Submissions close November 20.
• Full details and registration are at developercircles.devpost.com.

Hack Your Travel with OpenShift

To enter Red Hat's OpenShift hackathon, build an app that helps travelers get around town, plan a trip, or find guidance. All entries must be built on or migrated to the OpenShift Online platform and integrate JBoss Middleware. Cash prizes total $30,000, including a $2,000 student team award.

• Submissions close December 5.
• Full details and registration are at hackyourtravel.devpost.com.

Office 365 Hack Productivity 3

Enter Microsoft's third edition of Hack Productivity by building a productivity-boosting app for the workplace. Entries must use at least one Office 365 product, tool, or API. Prizes include $35,000 in cash, Surface PCs, a meeting with Microsoft Ventures, and promotion across Office channels.

• Submissions close December 18.
• Full details and registration are at office365hack3.devpost.com.