jWatchdog delivers a simple watchdog to actively monitor your infrastructure and send you notifications in case something goes wrong. It is configured using a simple XML configuration file. This configuration file can be changed on-the-fly without a need to restart the watchdog. jWatchdog does not offer data collection itself. It assumes that you already collected the data on which you want to run jWatchdog. The de facto standard tool Collectd is recommended for data collection. jWatchdog assumes that you use the RRDTool collectd output plugin to store the collected data in RRD files, or use Graphite as a datasource.
jZebra is a Java applet which allows you to print barcodes, receipts, and more from a Web page to your industry printer. It sends raw print commands and basic HTML and PDFs to your raw, PostScript, or LaserJet printer. It has been tested with Firefox, Safari, Internet Explorer, Chrome, and Opera. It supports parallel, serial, USB, and network printers.
The jab:ITS incident tracking system provides a browser-based help desk system for tracking and reporting customer support issues and occurrences. It features user registration and login, a list of incident items with a maximum of x number of items per page, the ability for customers to add and modify their own help desk items, the ability for administrators to modify any listing, the ability to search help desk items database by customer, product, keywords, etc., and email notification for customers and/or administrators.
jared (just another registry editor) is a Java library for editing the Windows registry. It reads a registry file into memory and allows modifications and rewriting of the file. It also contains a command line program for mods using a .reg file. The code supports gcj. jared is particularly appropriate for modifying or analyzing registry hives offline.
jblas is a fast linear algebra library for Java. It is based on BLAS and LAPACK, the de-facto industry standard for matrix computations, and uses state-of-the-art implementations like ATLAS for all its computational routines, making it very fast. It is essentially a lightweight wrapper around the BLAS and LAPACK routines. These packages originated in the Fortran community, which explains their archaic API. On the other hand, modern implementations are hard to beat performance-wise. jblas aims to make this functionality available to Java programmers such that they do not have to worry about writing JNI interfaces and calling conventions of Fortran code.