Are you looking for an alternative to Marketplacer or doing the research about the similar/competitor players like Marketplacer? Here is the compilation, we have not added the small generic players but the companies which has been making impact in the industry for quite a sometimes, as a bonus we have included our platform as well.
Few points to consider when deciding the solutions.
Are you an enterprise or a startup?
Are you on validation stage or growth or scale stage?
Are you focusing on app centric or just website?
Are you focused on too much features on supply side ?
Integrations with other tools…Consider all this points when you decide the solutions,