FreeTDS is a free re-implementation of the TDS (Tabular DataStream) protocol that is used by Sybase and Microsoft for their database products
FreeTDS is a free (open source) implementation of Sybase's db-lib,
ct-lib, and ODBC libraries. FreeTDS builds and runs on every flavor of
unix-like systems we've heard of, as well as Win32 (with or without
Cygwin), VMS, and Mac OS X. Failure to build on your system is probably
considered a bug. It has C language bindings, and works also with Perl
and PHP, among others.
FreeTDS is licensed under the GNU LGPL license. See COPYING.LIB for details.