The personal homepage of Sieuwert:


The personal homepage of Ernst:


Some games programmed by Ernst and Sieuwert:
Metro - The Board game
Paper and Pencil Racing


This is the website of blueRing software development, a small programming collective lead by Sieuwert van Otterloo and Ernst van Rheenen. blueRing has been planning the release of a software product for a secure email, but is currently in-active. This website is maintained as a place to publish our software, and as a place holder for future activity. We are still planning to start a company in the future.

Previous activity

In 2001 and 2002, blueRing has been developing a solution for secure email. This product has never made it to the market, but we have been very successful in business plan competitions (national finalist LiveWire 2002) and have gained a lot of experience.