* [ArcLight v1.6.3](https://github.com/projectblacklight/arclight) – Blacklight-based Rails engine for indexing and searching archival finding aids, supporting repository, collection, and component discovery via Solr.

* [Heliotrope 4.41](https://github.com/mlibrary/heliotrope) – Rails application extending Hyrax to provide publishing solutions for scholarly publishers.