List of free logging stuff for developerππ½
If you're looking for all programming tools around logging (not just free). Check this page List of logging Programming Tools

LogRocket
LogRocket helps you understand problems affecting your users, so that you can get back to building great software.
Tag: monitoring, logging
Includes 1,000 sessions / month 1-month data retention
Sentry
Self-hosted and cloud-based application monitoring that helps software teams discover, triage, and prioritize errors in real-time.
Tag: status, monitoring, logging
1 User 30 day data retention 5K errors 10K transactions 1GB attachments