Open source indexing projects
Every project in the registry tagged indexing, ranked by real GitHub adoption.
Ultra-fast data transformation for AI with lineage
Fast persistent recoverable log and key-value store + cache, in C# and C++.
TypeScript ETL toolkit for indexing Ethereum, Solana, and Substrate data, sourced from SQD Network.
Frequently asked questions
How many open source indexing projects are there?
This registry tracks 3 projects tagged indexing, with 19,548 GitHub stars between them. The most-adopted is CocoIndex at 11,572 stars.
Are these indexing projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which indexing project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these indexing projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.