In addition to projects and training for clients Just has initiated and participates in a number of Open Source projects, sometimes as part of research or interest, other times out of a need to develop a tool. Below is an overview of the main projects. Each project has its own project page.
See www.pushlets.com.
A HTTP-based public/subscribe framework. Event push to browser clients without using client-side Java.
This project seems to attract many developers since a publication in JavaWorld March, 2000.
See www.geoskating.com.
Generate interactive, multimedial skate-maps through GPS and mobile phones.
One of my most-fun projects. Involves a whole range of Java-technologies (J2ME, J2EE). See also a Dutch newspaper (Volkskrant) article
See www.geotracing.com.
Create a generic platform for remote tracklogging and real-time tracing through GPS with mobile phones. See also GeoTracing example applications: www.geoskating.com, www.geosailing.com and a geodrawing game.
See the KeyWorx homepage.
Develop a multi-user/multi-service/multi-channel application platform. More extensive info can be found in the KeyWorx documentation.
KeyWorx is under development at Waag Society in Amsterdam.
See www.justobjects.org/xbook.
Develop a toolset to generate HTML documentation from XML as a lightweight alternative to DocBook.
This site has been written and generated using XBook...
See www.justobjects.org/cowcatcher and SourceForge
Develop a toolset to generate HTML course materials from XML and provide content for Java training materials as a reusable repository of modules and lessons.
This project has helped us to quickly assemble materials and provide training to our clients. There is a lot of free stuff like complete online Java courses, so check it out.