KOJAC is a set of Java classes implementing optical elements and optics laws in order to build and simulate optical systems. It is also aimed at being a demonstrator of optics for educational purposes. Optical systems are composed of objects with defined properties that may be modified by the user through the applet's buttons and scrollbars. Such basic devices are lenses, apertures, interfaces, and may be themselves composite sets of other elements. KOJAC is able to do exact raytracing in 3 dimensions, taking into account the wavelength of the rays, and simulating real materials.
konspire is a searchable, distributed file-sharing system featuring resumable file transfers and fast, exhaustive substring searches of all hosted file names on the network. konspire is written using pure Java. Load from processing search requests is distributed throughout a dynamically connected network of servers. Several fault-tolerant features ensure system correctness and reliability.
The Legion of the Bouncy Castle Java Cryptography API provides a lightweight cryptography API in Java, a provider for the JCE and JCA, a clean-room implementation of the JCE 1.2.1, generators for Version 1 and Version 3 X.509 certificates, generators for Version 2 X.509 attribute certificates, PKCS12 support, and APIs for dealing with S/MIME, CMS, OCSP, TSP, CMP, CRMF, EAC, DVCS, OpenPGP, DTLS, and TLS. Versions are provided for the J2ME, and JDK 1.0-1.7.
GNU libavl is a library in ANSI/ISO C for the manipulation of binary trees and balanced binary trees. It is written using a literate programming system called TexiWEB. By way of TexiWEB, libavl is as much a textbook on binary trees and balanced binary trees as it is a collection of code.