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.
Librep is a shared library implementing a Lisp dialect that is lightweight, reasonably fast, and highly extensible. It contains an interpreter, byte-code compiler, and virtual machine. Applications may use the interpreter as an extension language, or it may be used for standalone scripts. Rep was originally inspired by Emacs Lisp. However one of the main deficiencies of elisp--the reliance on dynamic scope--has been removed. Also, rep only has a single namespace for symbols.
The Extended Universal Resource Locator library provides a complete virtualization of file-like objects. How data is stored is completely transparent to the client, since the library is meant to replace java.io.File. It provides implementations for handling local files, Jar/Zip archives, and XML documents. (Implementations for CVS and FTP are available seperately.) Other storage providers can be written and plugged in. It also provides a merged filesystem implementation that allows multiple hierarchies to appear as one and to override each other in a controlled way. Other features include notification of changes to files, and support for attaching (dynamically updatable) actions to file objects.
Botan is a crypto library written in C++. It provides a variety of cryptographic algorithms, including common ones such as AES, MD5, SHA, HMAC, RSA, Diffie-Hellman, DSA, and ECDSA, as well as many others that are more obscure or specialized. It also offers SSL/TLS (client and server), X.509v3 certificates and CRLs, and PKCS #10 certificate requests. A message processing system that uses a filter/pipeline metaphor allows for many common cryptographic tasks to be completed with just a few lines of code. Assembly and SIMD optimizations for common CPUs offers speedups for critical algorithms like AES and SHA-1.
JGraph is a free, mature, and robust Java diagramming library. It contains all the graph visualization, layout, and interaction functionality you might expect in a graph library, including multiple views, layering, zoom, drag and drop, undo, automatic expanding and collapsing, routing, and layouts. You can create workflow editors, BPMN, CAD tools, network diagrams, database visualization tools, and more. It is fully documented, including examples, and has an active support community.
vTemplate is a PHP class that is intended to make splitting PHP from HTML a simple and natural task. It has easily understandable syntax that is much easier to use than other template classes. It compiles a template into native PHP code using one PCRE call, thus the parsing is extremely fast. It also has powerful caching and debugging classes to extend the functionality.