I'm looking for a GUI client for Informix on Windows (mainly to view data and execute queries), free would obviously be nice but I know Informix is used mostly in corporate environments and free may not be available. Perhaps the best option is set up ODBC and use any one of many clients available?
I would suggest SQuirreL (free) but Informix doesn't appear to be supported
A Google search shows some older pages though so YMMV
Try out SQL Workbench/J it's a Java/JDBC based query tool similar to SQuirrel.
We have been using Aqua Data Studio with Informix for a long time. It is also Java/JDBC based. However, it can be quite expensive.