BizTalk360 - BizTalk360 is a web based production support/monitoring tool for Microsoft BizTalk Server.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Ragic - World's most advanced online database engine. Build powerful online databases with simple Excel style online interface.
mackerel.io - mackerel.io is a server and application performance monitoring platform.
Vty - Database Manager for Mysql, written with Php.