SQLite Database Browser - nice open source tool running on different platforms
SQLite Database Browser is a freeware, public domain, open source visual tool used to create, design and edit database files compatible with SQLite. It is meant to be used for users and developers that want to create databases, edit and search data using a familiar spreadsheet-like interface, without the need to learn complicated SQL commands. This program is not a visual shell for the sqlite command line tool. It does not require familiarity with SQL commands. It is a tool to be used both by developers and by end users, and it must remain as simple to use as possible.
