HTSQL a high-level query language and Web service gateway for relational databases. It comes with source code and is royalty free for any use with open source database systems such as MySQL, PostgreSQL, SQLite, etc. Licenses for using HTSQL in conjunction with proprietary databases such as Microsoft SQL and Oracle can be purchased.
Recent releases


Release Notes: This latest development release includes bugfixes and experimental ETL functionality for PostgreSQL.


Release Notes: A bugfix release to fix resource paths.


Release Notes: This release adds nested records, nested queries, locators, and improved output formats.


Release Notes: Licensing and packaging were updated. HTSQL is now free software under the AGPLv3 for SQLite, PostgreSQL, and MySQL.


Release Notes: This release adds a Web-based query editor with completion and syntax highlighting, as well as a Python API for embedded applications.