Easy SQL Server Tool using C#

https://code.msdn.microsoft.com/windowsapps/Easy-SQL-Server-Tool-using-6b0b7795

SQL Tools

SSMS

https://docs.microsoft.com/en-us/sql/ssms/sql-server-management-studio-ssms

SQL Pretty Printer AddIn for SQL Server Management Studio

http://www.dpriver.com/pp/sqlformat.htm

ApexSQL Compare, ApexSQL Complete, ApexSQL Refactor, ApexSQL Search

https://www.apexsql.com/Download.aspx

Red Gate's SQL Prompt

https://www.red-gate.com/products/sql-development/sql-prompt/

Poor Man's T-SQL Formatter

http://architectshack.com/PoorMansTSqlFormatter.ashx

SSMS Tools Pack

http://ssmstoolspack.com