Honeybadger's GitHub students page offers its Small plan free for an entire year (which it values at over $700). The plan includes a 225,000 error limit, 60 days of retention, 60 uptime checks, 120 check-ins, and unlimited users and apps.
Honeybadger covers error tracking, uptime monitoring and cron/check-in monitoring in one platform, with support for Ruby, JavaScript, Python, PHP, Go, Java and more.