One good way to come up with ideas for plugins is to look at other similar marketplaces or platforms and port them. For example, Joomla may have a very successf

One good way to come up with ideas for plugins is to look at other similar marketplaces or platforms and port them. For example, Joomla may have a very successful addon, but no Wordpress equivalent exists. You may find that specific addon isn't even being sold on Codecanyon.. make your own and sell it there. Another: go to users of a specific platform, say Wordpress, and ask them what's lacking or what could be improved. Another: integrate. Find some new software and see if there is a Wordpress plugin. Is there a Stripe plugin for Wordpress? Joomla? Drupal?