pgISQL (Interactive SQL for PostgreSQL) 

Interactive SQL for PostgreSQL is a powerfull database utility for building, executing and processing queries upon PostgreSQL databases.
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General SQL Parser 

General SQL Parser is developed to help people who want to check syntax of SQL statements, pretty print out SQL statements,and parse SQL statements into a parse tree in your own program.
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Aqua Data Studio 

Aqua Data Studio is a SQL editor and developer tool that allows developers to easily create edit and execute SQL scripts as well as browse database structures
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