Prestashop is a nice self-hostable web application for providing your own shop. It is generally open source and provides a vast number of extensions to make the shop fit your needs. Some of them also free, but also many being offered to purchase. When setting up a music shop for a friend of mine, there was one specific feature missing: Having the abilitiy to navigate on an alphabetic list of artists. There was no fitting extension to find, neither free nor commercial. For that reason, I developed a plug-in that does provide an alphabet navigation and lists articles of the selected letter based on the values of a configurable article feature. In my friend's case, the feature contains the artist's name.
Features:
Download of the latest module version: Feature Navigator version 1.0.1 (zip)
Source Code to be found at Github project featurenavigator
Initial release with the ability to navigate alphabetically via a feature.