mSQL
Mini SQL, or mSQL, is a lightweight database engine designed to provide fast access to stored data with low memory requirements. As its name implies, mSQL offers a subset of SQL as its query interface. Mini SQL Version 2 is the second generation of the Mini SQL product. mSQL 1.0 has been available in various forms since June 1994 and has undergone many enhancements to become a very popular and stable database system for small databases. mSQL 2 goes beyond the initial design goals of mSQL 1 and provides functionality suited to larger applications. It does this without reducing its performance on the simple tasks that mSQL 1 handled so well. The result being a lightweight database system suited to most data storage requirements. Despite being offered in source code form, and being strongly associated with open source software, mSQL itself has never been offered under an open source license. mSQL is provided free for non-commercial use. A typical license for commercial use in 1997 would cost $170, compared to a "five-digit purchase price" for its full-featured competitors.
