Guys,
We are developing a web tool called OmniDB: http://www.omnidb.com.br/en_index.aspx
OmniDB supports Firebird, MariaDB, MySQL, Oracle, PostgreSQL, SQLite, Microsoft SQL Server and Microsoft Access.
OmniDB provides a unified workspace to manage databases from different DBMS in a comfortable way. It also can convert schemas between any supported databases and it's very simple to configure.
Yesterday we released version 1.6, with many improvements, including support for functions and procedures on all supported RDBMS systems and full dark theme.
We are looking forward to hear feedback from the community. Thanks in advance!
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William Ivanski