GBDI Arboretum is a portable C++ library which implements various Metric Access Method (MAM). By using this library applications will be able to perform similarity queries (queries by contents).
A lightweight (Java/J2EE), multiplatform web based query tool and reporting environment. Supports tabular, crosstab, charts, scheduling; data exportable to spreadsheet.
Java library to execute SQL statements stored in external library files. This separation increases readability, eases maintenance, and allows separate testing and documentation. [MIT]
Both a single user and client/server versions with ODBC drivers. Distributed under a modified GPL that allows distribution of applications without including source code. Commercial support available.
Hamsterdb is written in ANSI C and supports a B+Tree index structure, uses memory mapped I/O (if available), supports cursors, and can create in-memory databases.
An integrated environment for managing data. It helps creating database schemas, inserting, querying and processing data. Screenshots, downloads, resources, a wiki and a list of involved developers.