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.
hamsterdb Transactional Storage is an ANSI-C implementation of a key/value database engine. It has a lock-free architecture, thus supporting an arbitrary number of long-running transactions and resolves transaction conflicts in memory without accessing the disk. hamsterdb uses logical, idempotent logging for recovery. It is thread-safe and concurrent, moving performance intensive operations to the background. Every hamsterdb handle can be used from arbitrary threads.
FlashQard helps you to learn any subject that can be learned via a question and answer format. You write a question on a card and the answer overleaf in formatted text. You can also insert as many pictures as you wish. The reviewing method is known as the Leitner system, proposed by Sebastian Leitner in 1970s. This method is a well known and widely used method to efficiently use flash cards and to reduce the amount of study time needed. FlashQard can read your card's text (text-to-speech) as you go through your cards.