DBeaver - DBeaver - Universal Database Manager and SQL Client.
dbForge SQL Complete - Try Intellisense functionality and Improved SQL Formatter in SQL Server Management Studio and Visual Studio using SQL Complete!
DataGrip - Tool for SQL and databases
Dataedo - Database documentation tool
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
SQL Data Dictionary - Easily generate a PDF or HTML data dictionary from SQL Server with just a few clicks.