There's a Kobo developer forum here...
https://www.mobileread.com/forums/forumdisplay.php?f=247
There are a few projects for other software...
Koreader
Cool Reader
Depends on what you want it to do I suppose. Between asking questions here on MR and checking out a few Youtube videos you'll probably get a good idea of what it's like. Also some indie bookstores carry them and so does Family Christian so you might be able to find someplace in your are to get a hands on.