Enlight - Performance and Error Monitoring. We keep an eye on your applications and notify you about performance issues and errors.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Lambda School - A full Computer Science education - free until you get a job
Momentum - Agile goal and performance management
Free Code Camp - Learn to code by helping nonprofits.
Streaks - The to-do list that helps you form good habits.