I'd vote for a "Market Place Application" for OS/2, eCS and Arca Noae Blue Lion as one otherwise may have to search the net for a long time to find useful gems for hours that others may already know about. Don't invent the wheel over and over again.
It could use info from for example eCSoft/2 to present applications, drivers etc. to the user with descriptive text/summary, a sample image, application icon and link to the authors web site etc.
A Market Place App should itself not be an installer, just give information in a pleasant and informative way and initiate downloads and hand over the rest to whatever installer technology each application use, that take care of the rest, such as adding required libraries. Optional components can of course be... optional/selectable.