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Re:HeidiSQL – GUI client for MariaDB, MySQL, Microsoft SQL S... by manigandham on Thursday January 17, 2019 @01:28PM (#18933158)
DBeaver is solid and supports the most DBs with lots of handy features: https://dbeaver.io/

Jetbrains Datagrip is popular too, more intelligent but less DBs than DBeaver: https://www.jetbrains.com/datagrip/

If you want a web-based tool, especially for Postgres, then OmniDB is a good choice: https://www.omnidb.org/en/

Re:HeidiSQL – GUI client for MariaDB, MySQL, Microsoft SQL S... by soperj on Thursday January 17, 2019 @01:39PM (#18933254)
I'll second DBeaver.
Re:HeidiSQL – GUI client for MariaDB, MySQL, Microsoft SQL S... by pca2 on Thursday January 17, 2019 @02:02PM (#18933502)
third!
Re:HeidiSQL – GUI client for MariaDB, MySQL, Microsoft SQL S... by morenoh149 on Thursday January 17, 2019 @04:09PM (#18934648)
fourth dbeaver db support and data model diagramming
Re:HeidiSQL – GUI client for MariaDB, MySQL, Microsoft SQL S... by brylie on Thursday January 17, 2019 @02:49PM (#18933943)
Interestingly, OmniDB is built with Django.

DBeaver has support for many databases through JDBC.