iODBC is a cross-platform Driver Manager that comforms to the Microsoft ODBC 2.x & 3.x and X/Open SQL CLI data access specs. It enables the development of database-centric solutions that are both database and platform independent. This is a great SDK for porting WIN32-based ODBC applications to Linux and other OS platforms.
iSPARQL is the OpenLink interactive SPARQL Query Builder, a utility for building and executing SPARQL queries. It may be used on any standard SPARQL endpoint, but can utilize the full power of Virtuoso Sponger when connected to a Virtuoso endpoint. The queries, together with various parameters, may be saved in a WebDAV-capable file server.