SQuirrel SQL

The program provides a graphical interface for exploring the schema and contents of any database that offers a JDBC driver. It displays tables, columns, indexes, and relationships, and lets users run arbitrary SQL queries against the connected database. Results can be viewed in a grid, exported to Excel, or copied in various markup formats.

It is aimed at developers and database administrators who need a lightweight, cross‑platform tool for inspecting and testing databases without writing code. The client runs on Java, supports multiple simultaneous connections, and includes features such as bookmark execution, configurable auto‑refresh of query results, and password encryption for stored connection aliases.

What distinguishes this client is its extensibility through plugins, a built‑in editor based on RSyntaxTextArea, and a set of usability enhancements like toggling monospaced fonts for table columns and tree‑view display of user bookmarks. The latest stable release (5.1.0) adds these refinements while maintaining compatibility with any JDBC‑compliant database.