You may want to check out these sites:
www-3.ibm.com/chips/news/2001/0129_np-sw.html
Artilce about how to use tools. researchweb.watson.ibm.com/journal/sj/361/guinan.html
Informix Tools - Informix Application Development Tools
www-3.ibm.com/software/data/informix/tools/
http://www7b.boulder.ibm.com/wsdd/library/techarticles