OmniDB is designed to access PostgreSQL, MySQL and Oracle in one interface, though makes sure it provides full features for the PostgreSQL database.
OmniDB is developing quickly, with monthly feature releases so I recommend you check out the latest information at https://omnidb.org/.
OmniDB provides a very responsive interface and is designed with full security in mind. It has the standard tree-view browsing interface, with multi-tab access for each database server you access. It’s easy to be connected to multiple PostgreSQL, MySQL and Oracle database servers all at the same time:
OmniDB has an SQL editor that has code completion and debugging. EXPLAIN ANALYZE output is colored to highlight the areas of the plan taking the most time:
There are some very cool graphics features that are best seen using live data, so give it a try.