Type 4 drivers for MS SQL Server, Oracle, Sybase, DB2, Plain Text and a type 3 JDBC to JDBC driver. [Commercial]

Type 3 (JDBC to JDBC) driver based on Java RMI. [Open Source, LGPL]

Open source JDBC driver framework for developers. Includes a type 4 driver implementation for PostgreSQL. [Open Source, LGPL]

A JDBC driver that allows performing SQL statements and other JDBC operations upon text files (comma separated, tab-separated, fixed length).

Type 4 JDBC driver for XML Database (not maintained for a long time). [Open Source, MIT License]

Type 4 read-only JDBC driver for Comma Separated Value (CSV) (not maintained for a long time) files. [Open Source, LGPL]

RMI based Type 3 JDBC driver for use with other JDBC drivers. [Free]

A rapid to implement SDK to provide high-end SQL functionality and performance to proprietary or legacy data source.

A JDBC type 3 driver which provides efficient tunneling of JDBC commands/results over different communication protocols (i. e. RMI or HTTP) [Opensource, LGPL]

Providing Type 4 JDBC drivers for MS Access, MS Excel, Corel Paradox, Text (CSV, fixed length, variable-length), and Xbase (dbase, Foxbase, Foxpro, Clipper). [Commercial]