- https://dbdb.io/ is a comprehensive list of database management systems
- databases can be filtered by features, license, and many other criteria on the [browse](https://dbdb.io/browse) page
- there is also a [leaderboard](https://dbdb.io/stats) page that shows "top" projects
- the website generator is FOSS under the Apache 2.0 license https://github.com/cmu-db/dbdb.io
- people wanting to submit new databases or suggest improvements can do so at https://github.com/cmu-db/dbdb.io/issues
- each database software page has extensive details about each project (e.g. https://dbdb.io/db/postgresql)
- it does a better job at listing/reviewing database systems than awesome-sysadmin would ever hope to do
- all projects that were listed on awesome-sysadmin are already listed there (except abandoned ones like https://github.com/awesome-foss/awesome-sysadmin/pull/436, and adminer - I'll submit a separate PR to re-add it)
* [LibreMailer](https://github.com/averna-syd/LibreMailer) - Libre Mailer is a modest and simple web based email marketing application.
* [LibreMailer](https://github.com/averna-syd/LibreMailer) - Libre Mailer is a modest and simple web based email marketing application.
* [Lewsnetter](https://github.com/bborn/lewsnetter) - E-mail marketing application (create and send e-mail newsletter via SES). Includes subscription management, delivery, bounce and complaint notification, templates, and some stats.
* [Lewsnetter](https://github.com/bborn/lewsnetter) - E-mail marketing application (create and send e-mail newsletter via SES). Includes subscription management, delivery, bounce and complaint notification, templates, and some stats.
### NoSQL
*NoSQL databases.*
* Column-Family
* [Apache HBase](http://hbase.apache.org/) - Hadoop database, a distributed, big data store.
* [Cassandra](http://cassandra.apache.org/) - Distributed DBMS designed to handle large amounts of data across many servers.
* [Hypertable](http://hypertable.org/) - C++ based BigTable-like DBMS, communicates through Thrift and runs either as stand-alone or on distributed FS such as Hadoop.
* Document Store
* [CouchDB](http://couchdb.apache.org/) - Ease of use, with multi-master replication document-oriented database system.
* [ElasticSearch](https://www.elastic.co/) - Java based database, popular with log aggregation, and email archiving projects.
* [MongoDB](https://www.mongodb.org/) - Another document-oriented database system.
* [RavenDB](http://ravendb.net/) - Document based database with ACID/Transactional features.
* [RethinkDB](http://www.rethinkdb.com/) - Distributed document store database, focuses on JSON.
* [eXist-DB](Https://www.exist-db.org/) - Open Source XML Database
* [Galera](http://galeracluster.com/) - Galera Cluster for MySQL is an easy-to-use high-availability solution with high system up-time, no data loss, and scalability for future growth.
* [MariaDB](https://mariadb.org/) - Community-developed fork of the MySQL.
* [adminer](https://www.adminer.org/) - Database management in a single PHP file ([Source code](https://github.com/vrana/adminer))
* [Percona Server](https://www.percona.com/software) - Enhanced, drop-in MySQL replacement.
* [PostgreSQL](http://www.postgresql.org/) - Object-relational database management system (ORDBMS).