Proxying
Solves - "I need to access MS SQL Server from Linux or Oracle from FreeBSD (or other unsupported platform)."
Access databases from unsupported platforms.
Oracle, for example, doesn't support ARM Linux, FreeBSD, NetBSD or OpenBSD. But, by running the SQL Relay server software on a supported platform such as x64 Linux and the SQL Relay client software on the unsupported platform, the unsupported machine can access the Oracle database.
In fact, the SQL Relay client software can be built and run on most unix-like systems, independent of architecture. As such, SQL Relay can provide access to databases from a wide variety of platforms not supported by the database vendor.