JEquity supports 3 databases:

• Apache Derby (default)
  For more information, read https://en.wikipedia.org/wiki/Apache_Derby.
• MySQL
  For more information, read https://en.wikipedia.org/wiki/MySQL.
• PostgreSQL
  For more information, read https://en.wikipedia.org/wiki/PostgreSQL.

You may change the database settings under Tools | Options and select the Connections tab. After making changes, you must restart the application.