CouchDB, Redis, RethinkDB, InfluxDB, MySQL, MSSQL, MongoDB, Neo4J
MongoDB has died for us because CouchDB is better. CouchDB and Redis will be replaced by RethinkDB in our projects/products. InfluxDB used for time series data like logging and monitoring data changes over time. MySQL as requested by customers who are scared of anything new. MSSQL as requested by customers who are scared of anything free and new. Neo4j was excellent for querying relational data. But its Java and Java is a plague. Uninstall anything Java related is the only valuable option IMO.