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MariaDB
MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry. (by MariaDB)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
MariaDB [1] is a community developed fork of MySQL, so you can feel free to use that in place of MySQL.
Another alternative would be Percona [2] which is a drop-in replacement for Oracle MySQL.
About PostgreSQL I haven't had that much of personal experience with it, but for sure I plan to learn it, because it has been battle-tested for years with lots of well-known projects, such as Django framework, for instance.
[1] https://github.com/MariaDB/server
[2] https://github.com/percona/percona-server
MariaDB [1] is a community developed fork of MySQL, so you can feel free to use that in place of MySQL.
Another alternative would be Percona [2] which is a drop-in replacement for Oracle MySQL.
About PostgreSQL I haven't had that much of personal experience with it, but for sure I plan to learn it, because it has been battle-tested for years with lots of well-known projects, such as Django framework, for instance.
[1] https://github.com/MariaDB/server
[2] https://github.com/percona/percona-server