|SuperOrca - MSI Editor|
This editor is (currently?) free and doesn't lock the msi like "ORCA" does. It looks promising and its homepage is "http://www.pantaray.com/msi_super_orca.html".
It allows you to see numeric columns in decimal, hexadecimal as well as binary.
It has an msi compare function which in version 126.96.36.199 also shows 2 "pairs" of lines for many unchanged properties so take it with a grain of salt...
It doesn't handle transforms at all and has limited merge options.
It doesn't automatically detect "ORCA" ice validation suites but you can specify alternative suites.
A sample screenshot: