Open Source Keyword Research Tool
Keyword research has an awkward truth: real search-volume numbers live behind paid APIs that no open project can legally redistribute, which is why this space stays thin. So the open tools here do not pretend to sell you metrics - they help you generate, cluster, and expand keyword ideas, or pull data through a key you supply yourself, leaving the expensive numbers to whichever provider you choose to pay.
OpenSEO
Open source SEO platform for keyword research, backlinks, rank tracking, site audits, and AI visibility
SerpBear
Open source search engine position tracking and keyword research app with email alerts and a built-in API
RespectASO
Privacy-first ASO keyword research for macOS with no API keys, accounts, or data leaving your machine
SEO Panel
Open source SEO control panel for managing multiple websites, with rank tracking, auditing, and backlink checks