Here's a quick overview of Indexer projects::
- NEAR Indexer for Explorer: an indexer built on top of the indexer microframework. It watches and stores all events/data from the blockchain to a PostgreSQL database.
- NEAR Lake Framework: a companion library to NEAR Lake. It allows you to build your own indexer that watches a stream of blocks from a NEAR Lake data source and allows you to create your own logic to process that data. Keep in mind this is probably the one you want to use for future projects, instead of the Indexer Framework. Read why.
- NEAR Indexer Framework: a micro-framework providing you with a "live" stream of blocks. Useful to handle on-chain real-time "events".
- NEAR Lake Indexer: an indexer built on top of the indexer microframework. It watches the blockchain and stores all events/data from the blockchain as JSON files on AWS S3 or S3 compatible storage.