2. cache-wp-queryCache posts from WP_Query in an automatic wrapper for WP_Query, avoid extra DB requests. Integrates with ElasticPress to cache those requests too!
3. ghost-metaGhost meta allows you to store multiple meta values in a single meta record, with an API that mirrors the Metadata API. It integrates with ElasticPress to expand all ghost meta so Elasticsearch can query as normal meta too.
4. wp-admin-uiA PHP class to build Admin interfaces within the WordPress Dashboard -- includes tables, add/edit forms, sorting, filtering, and exporting