dbForge SQL Complete - Try Intellisense functionality and Improved SQL Formatter in SQL Server Management Studio and Visual Studio using SQL Complete!
DBeaver - DBeaver - Universal Database Manager and SQL Client.
Dataedo - Database documentation tool
MySQL Workbench - MySQL Workbench is a unified visual tool for database architects, developers, and DBAs.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
SQL Doc by Red Gate - Document your databases automatically.