CodeBase is a high-speed xBASE compatible database engine for C/C++, Visual Basic, Delphi & Java programmers. You can use CodeBase to write high performance database applications that are multi-user compatible with FoxPro, dBASE and Clipper, create anything from a Java applet to a full-blown Windows database application to a simple DOS utility, write scalable applications that can be deployed as single-user, multi-user or client/server, all without changing any of your source code, and port your applications to Windows, DOS, UNIX, OS/2, and Macintosh. There's a free 30-Day Test Drive option available. CodeBase is available for every major operating system including Windows XP, 2000, 9x, NT, CE, DOS, OS/2, Macintosh, and a variety of Linux and UNIX platforms including Solaris, SunOS, HP/UX, AIX, SCO, and others.
ObjectDB for Java/JDO is a powerful yet compact Java Data Objects (JDO) Object Database (ODBMS), written entirely in Java, and compliant with the Java Data Objects (JDO) standard developed by Sun (JSR12). ObjectDB for Java/JDO is designed to efficiently handle databases of various sizes, ranging from a few KBs to hundreds of GBs. Among its features are small footprint, high performance, rapid development, easy deployment, and flexible architecture (1-Tier, 2-Tier, or N-Tier).
hamsterdb Embedded Storage is an embedded database engine written in ANSI-C. It includes B+Trees with variable length keys and records. It supports in-memory databases and endian-independent files, database cursors, multiple databases in one file, "record number" databases, and duplicate keys. hamsterdb is very fast and highly configurable. It compiles and runs on Unix platforms, Linux, Microsoft Windows, and Windows CE.
db4o is an object database for Java and all .NET environments. Its features include ACID transactions, automatic class schema recognition, query-by-example, a S.O.D.A. object querying API, native queries, LINQ support on .NET, callback methods, memory files, cascade-on-delete, multi-threaded access, and Java Webstart and servlet support.
JCards is a Java application designed to store and manage data in any format that the user defines. Instead of having multiple applications/spreadsheets/databases to manage passwords, tasks, shopping lists, etc., JCards allows the user to define a database that contains the fields they want. This is accomplished via an easy to use interface that requires no understanding of SQL or any other database jargon. JCards was initially developed for PDAs, but has now branched into another version that is suitable for the modern desktop environment and includes a number of extra features.
Whiskers is an educational PocketPC application that tries to exploit all the hardware available on most common PDAs providing a link between different features such as GPS-Bluetooth-Wireless. Generally, whiskers was built with radio reconnaissance in mind as help for geocachers or wardrivers, but also as a penetration and audit tool. There is support for in-depth device scanning, triggering actions based on filters when certain devices are in range, centralized GPS logging with search functions for private or public databases, and much more.