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
SQL Prompt - SQL Prompt Pro strips away the repetition of coding by making writing, formatting, and refactoring...
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
ApexSQL Complete - ApexSQL Complete can automatically fill in SQL keywords, statements and identifiers.