You can download a DevXpress 30 day trial here:
. With this you will be able to compile the source and run it; after the 30 days you will still be able to compile but not to use the WPF designer view, and you'll get a "trial" message
The library is using DevXpress WPF Grid when you create a "Big Data Table". It is a clone table of your current worksheet selection; in thos "Big Data Table", you can arrange rows by grouping them on your selected columns. You can also add
new rows, with a control on the column type for each value. Once you're done, you can copy back the data to the spreadsheet.
I will put the Avalon Dock replacement as Issue 1 and DevXPRess WPF DataGrid replacement as Issue 2, as it should run on open source software only.