Interact is an online learning and collaboration platform that was developed by the Christchurch College of Education. It is a free alternative to the likes of WebCT and Blackboard, and was designed with the intention of making it easy for students and lecturers to interact online, and focuses on constructivist and Vygotskian views of teaching and learning.
J-Ben is an aid for studying Japanese. Its primary focus is for looking up and studying kanji (the Chinese characters used in Japanese writing). It also features kanji and vocabulary study lists, cross-referencing of kanji searches with the vocabulary list, a kanji flash card drilling mode, and a Japanese-English dictionary.
JRegexpTester is a standalone Swing application that helps you test regular expressions with the Java standard API (java.util.regex). The extracted data can be modified with formatters similar to those used by sprintf, or with standard Java date and decimal formatters. It features RegExLib library integration with more than 900 patterns. It can also help you manage CSV files.
JSBSim is a multi-platform flight dynamics model. The FDM is essentially the physics/math model that defines the movement of an aircraft under the forces and moments applied to it using the various control mechanisms and from the forces of nature. JSBSim has no native graphics. It can be run by itself as a standalone program, taking input from a script file and various aircraft configuration files, or it can be run as an integrated part of a larger flight simulator implementation that includes a visual system. The most notable usage example is the FlightGear simulator. JSBSim models the aerodynamic forces and moments by the classic coefficient buildup method.
Jacksum is a platform-independent utility for computing and verifying checksums, CRCs, and message digests, as well as timestamps of files. It supports most common checksum algorithms. The format of the output is fully customizable. The program is large-file-aware, and recursive file processing as well as platform-independent file verification are supported.
Japanese Vocabulary is an application for studying Japanese vocabulary. It consists of a set of cards, each with the kanji spelling, kana reading, and the meaning in English (or another language). It uses the Leitner system for managing the cards, which means that you see the cards you know well less often than you see the ones that you don't know very well. This allows the learner to focus on learning those words with which they are having trouble. It comes with the JLPT 2, 3, and 4 vocabulary lists.