9 companies, 9 verified offers, re-checked weekly.
Not sure which you qualify for? Match your repo.
Monitoring, 9 companies
IDCompanyWhat you getStatusVerified
FOS-0008AppSignalerror trackingmonitoringFree sponsored AppSignal account for open-source software and "for good" projects, with core monitoring…ACTIVEverified 2026-09-07›
What you get
Free sponsored AppSignal account for open-source software and "for good" projects, with core monitoring features: error tracking, performance monitoring, host monitoring, anomaly detection, uptime monitoring and log management. No named tier or hard limits published on the page.
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Email support@appsignal.com with the subject "Hi AppSignal, can I get a sponsored account?" to request a sponsored account.
Provenance
Confirmed against appsignal.com/open-source on 2026-09-07, matched anchor “is Free for Open-Source Software”.
FOS-0018BlackfiremonitoringA free Blackfire Profiler subscription for each project lead and core committer, valid for one year and…ACTIVEverified 2026-09-07›
What you get
A free Blackfire Profiler subscription for each project lead and core committer, valid for one year and renewable while the project still qualifies. For developing non-commercial open source projects only; subscriptions cannot be shared.
FOS-0060DatadogmonitoringsecurityFree Datadog account for the project's own infrastructure: cloud observability and security platform…ACTIVEverified 2026-09-07›
What you get
Free Datadog account for the project's own infrastructure: cloud observability and security platform including infrastructure and APM monitoring, 1,000+ integrations, code analysis and profiling, and database/user activity monitoring. Host counts and telemetry event volumes may be limited.
FOS-0070elmah.ioerror trackingmonitoringFree Small Business subscription to elmah.io (error logging and uptime monitoring for .NET) to monitor…ACTIVEverified 2026-09-07›
What you get
Free Small Business subscription to elmah.io (error logging and uptime monitoring for .NET) to monitor your open source project. Subscription may only be used for the open source project itself.
Applies to
the project , not individual maintainers
Requirements
public repositorynon-commercial / non-profit
run a repo match above to see which you meet →
How to apply
Get in contact with elmah.io (via site contact) to redeem the free subscription, per the open source sponsorship page.
Provenance
Confirmed against elmah.io/sponsorship/opensource on 2026-09-07, matched anchor “Monitor your open source website for free”.
FOS-0071Emerge ToolstestingmonitoringEmerge's mobile app Size Analysis free for non-commercial open source projects: automated size…ACTIVEverified 2026-09-07›
What you get
Emerge's mobile app Size Analysis free for non-commercial open source projects: automated size insights, size tracking on every pull request, public shareable build links, dynamic README badges, and up to 5 maintainer accounts.
Applies to
the project , not individual maintainers
Requirements
public repositorynon-commercial / non-profit
run a repo match above to see which you meet →
How to apply
Submit your repository via the Google Form linked on the open-source page to receive setup instructions.
Provenance
Confirmed against emergetools.com/open-source on 2026-09-07, matched anchor “Size Analysis is free for non-commercial open source projects”.
FOS-0092Healthchecks.iomonitoringBusiness plan free of charge for open-source projects and nonprofits: monitor 100 jobs, 1,000 log…ACTIVEverified 2026-09-07›
What you get
Business plan free of charge for open-source projects and nonprofits: monitor 100 jobs, 1,000 log entries per job, 50 SMS/WhatsApp credits, 20 phone call credits, and email support (vs. the generic free tier's 20 jobs and no credits).
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Contact Healthchecks.io (via the contact/about page) to get set up.
Provenance
Confirmed against healthchecks.io/pricing on 2026-09-07, matched anchor “Business plan free of charge for open”.
FOS-0148Scout APMmonitoringerror trackingFree access to Scout's Large plan with full features: application traces, error monitoring, log…ACTIVEverified 2026-09-07›
What you get
Free access to Scout's Large plan with full features: application traces, error monitoring, log management, query analysis, and alerting. Supports Ruby, Python, PHP, and Elixir.
Applies to
the project , not individual maintainers
Requirements
OSI-approved licensepublic repository
run a repo match above to see which you meet →
How to apply
Open a support ticket via the "Apply for Free Access" link on the offer page with a link to your repo and a brief description.
Provenance
Confirmed against scoutapm.com/open-source on 2026-09-07, matched anchor “open source license”.
FOS-0151Sentryerror trackingmonitoringFree sponsored plan with Business features and no term limit: 5M errors, 5,000GB logs, 1B spans, 100K…ACTIVEverified 2026-09-07›
What you get
Free sponsored plan with Business features and no term limit: 5M errors, 5,000GB logs, 1B spans, 100K replays, 500 cron monitors, 25 uptime monitors, 3K continuous profile hours, 150 UI profile hours, 10GB attachments, 1,000 size analysis uploads, and Seer for 5 active contributors; overage budget can be enabled.
Applies to
the project , not individual maintainers
Requirements
OSI-approved license
run a repo match above to see which you meet →
How to apply
Application form on the offer page: provide name/email/website, select "Open-Source" company type, Sentry org details, project description and GitHub repository link.
Provenance
Confirmed against sentry.io/for/open-source on 2026-09-07, matched anchor “Open-Source Sponsorship”.
FOS-0181WebGazermonitoringComprehensive monitoring services at no cost for eligible open source projects: website monitoring…ACTIVEverified 2026-09-07›
What you get
Comprehensive monitoring services at no cost for eligible open source projects: website monitoring (HTTP monitors), cron job monitoring (heartbeat monitors), and hosted status pages.
Applies to
the project , not individual maintainers
Requirements
no stated requirements
How to apply
Submit the application form on the offer page with project name, contact email, project URL, repository URL, and a project description; questions to support@webgazer.io.
Provenance
Confirmed against webgazer.io/for/open-source on 2026-09-07, matched anchor “free to open source projects”.