Are there services similar to bitrix24, for which you can also develop and publish your solutions for sale?

Question

CRM

Interested in whether there are services that are approximately the same in functionality as bitrix24, with the same opportunity to develop their own solutions for them. And the presence of the same platform as the marketplace, where these solutions can be published for sale.

Answer 1

Wordpress
https://market.envato.com/ / https://codecanyon.net/category/wordpress
look for success stories, but you can still multiply the cost by the number of sales