solr is queued for analysis. Crawling candidates and ranking them takes a few minutes. This page updates itself when the list exists — you can also come back later.
What is known so far comes from the other direction:
These projects were analysed and named solr among their alternatives. The relationship is not symmetric — how solr rates them is a separate judgement, made when solr is analysed in its own right.
calls solr “When you want a mature Java-based search server with rich query features and are willing to use Solr's API rather than Elasticsearch's.”
Free and Open Source, Distributed, RESTful Search Engine
calls solr “When you need a mature Java search server with rich features and ecosystem.”
Tantivy is a full-text search engine library inspired by Apache Lucene and written in Rust
calls solr “Choose when you need a standalone Java search server with faceting and full-text; not a client-side library.”
Next-generation full-text search library for Browser and Node.js
calls solr “Choose for a Lucene-based search server with a different REST API and strong faceting when Elasticsearch compatibility is not required.”
🔎 Open source distributed and RESTful search engine.
calls solr “Use when you need a full-featured Java/Solr search server rather than a client-side JS index.”
A bit like Solr, but much smaller and not as bright