HeidiSQL is a useful and reliable tool designed for web developers using the popular MySQL server, Microsoft SQL databases and PostgreSQL.
Code repository and tickets have moved to https://github.com/HeidiSQL/HeidiSQL in Nov 2017.
Dataman is a fully multi-threaded database server and client API libraries in C, C++, Java, and a PHP module has now been added as well. This is a 'direct access' database, not a relational one. It emulates the verbs of the EDITOR language.
SqlCli provides a poor-man's command line client to any RDBMS that is accessible via a JDBC driver. This allows connecting to a remote database and issue ad-hoc SQL commands, without needing to install a commercial or proprietary client.