Firebird is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers. It has been used in production systems, under a variety of names, since 1981.

HSQLDB is the leading SQL relational database engine written in Java. It has a JDBC driver and supports a rich subset of ANSI-92 SQL (BNF tree format) plus SQL 99 and 2003 enhancements. It offers a small (less than 100k in one version for applets), fast database engine which offers both in-memory and disk-based tables and supports embedded and server modes. Additionally, it includes tools such as a minimal web server, in-memory query and management tools (can be run as applets) and a number of demonstration examples.

Tokyo Cabinet is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value. Every key and value is serial bytes with variable length. Both binary data and character string can be used as a key and a value. There is neither concept of data tables nor data types. Records are organized in hash table, B+ tree, or fixed-length array.

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.

Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java and available under the Apache License

Java™ * – as a platform-independent programming language – has the disadvantage that the generated bytecode can be decompiled relatively easily. Thus, your Java™ based development is fairly unprotected. Considering this, we have developed the JarCryp™ technology, which is included within the JInstaller™ Secure Edition The JInstaller™ Secure Edition… . This technology enables us to encrypt your bytecode without the need for any Virtual Machine modifications

ClassGuard is a tool to prevent Java decompiling. Your Java class files are encrypted using a 128Bit AES encryption. The AES key is generated randomly every time you start the encryption tool. The decryption is done transparently by a custom class loader. The main part of this class loader is written in C to prevent decompiling and other tampering.

tweet 4 blood you can tweet your blood requests to followers @tweet4blood who are donors. Tweets are also hashtagged city wise for easy finding.

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we decided to implement a "schema-less" storage system on top of MySQL rather than use a completely new storage system. This post attempts to describe the high-level details of the system. We are curious how other large sites have tackled these problems, and we thought some of the design work we have done might be useful to other developers.