If you are on Windows, then HeidiSQL is very good (MySQL, MSSQL and PostgreSQL).
If you just want something very light and easy and runs in a browser, then Adminer is pretty good (not an IDE, but certainly better than PHPMyAdmin).
If you just want something very light and easy and runs in a browser, then Adminer is pretty good (not an IDE, but certainly better than PHPMyAdmin).
I've been using it on Linux for quite some time. Being able to work on MSSQL from Linux is just great :)
Another issue is that while it's open source, it's written in a language that requires an obscure, proprietary and expensive compiler, which makes contributing to it basically impossible.