this is my passion project. I was unable to find nice SQL client for Linux, so I created it on myself. I have created proprietary SQL client for Windows in past, so this app is influenced by experiences from this work. Recently I have added support also for noSQL, MongoDB.
It's built on Electron using Svelte. Although Electron apps tends to be clumsy, partly thanks to Svelte framework is the app fast enough.
It's open source (MIT), cross-platform (Linux, Mac, Windows), or can be run as web-based application in browser. Hope it could be useful also for others.