Notra
69 · StableAsks ChatGPT, Claude and Gemini the questions your buyers ask, and shows whether your brand comes up and who comes up instead.
Open source SEO
Keyword research, rank tracking, backlink analysis and site audits. Ranked by health score.
LibreCrawl
66 · StableWebsite crawler for technical SEO that finds broken links, redirects and missing tags, and exports the results.
OpenSEO
64 · StableSEO suite with keyword research, rank tracking, backlink analysis and site audits, plus an MCP server for AI agents.
At a glance
Health and license are separate verdicts: a project can be well maintained and still not be open source.
| Project | Health | License | Stars |
|---|---|---|---|
| Notra | 69 · Stable | Free, share hosted changesAGPL-3.0 | 256 |
| LibreCrawl | 66 · Stable | Free to useMIT | 1.0k |
| OpenSEO | 64 · Stable | Free to useMIT | 23k |
Paid products these replace
Alternatives to AhrefsAlternatives to AthenaHQAlternatives to Otterly.AIAlternatives to Peec AIAlternatives to ProfoundAlternatives to PromptwatchAlternatives to Screaming Frog SEO SpiderAlternatives to ScrunchAlternatives to SemrushAlternatives to Ubersuggest
Scores last refreshed from GitHub on 9 October 2026. How we score.