I uploaded a new version of FontTesterPlus to my Gallery : http://community.coreldraw.com/media/g/claudep/default.aspx

- In the Miscellaneous docker, I changed the OpenTypeFeatures mode in such a way that it now list all the OpenType tables in the drop down next to the mode drop down.

- Selecting an item in that Drop down will render a visual representation of the rules (lookups) that are used to implement the selected feature.

- I did not implement all the lookup types yet but most of them are.

- Font users can, for example, use this tool to figure out what are the ligatures for a selected font. 

- Font designer can use this tool to visualize their lookups.