Installing OpenAppMkt is easy, point Safari to http://www.OpenAppmkt.com/ and follow procedure shown on your screen. Safari bookmark appears on your screen. Activate bookmark, you will have access to OpenAppMkt web app; browse web apps and install the corresponding bookmarks on your screen. In a nutshell there is no physical installation of apps. Only Safari bookmarking is done on your home screen.
This is a nice and easy to follow concept and the procedure is simple to implement. Probably this is the best alternative to an App Store or even Cydia too!
Check out the below video to know more about OpenAppMkt: