I want to create a plugin for Jira software and host it on Atlassian Marketplace for use by my organization (not intended for public use). I understand that I could use Connect or Forge to create Atlassian Apps, however, I am not sure about the costs involved in hosting these apps. I would like to know if costs are only incurred for using the Atlassian Cloud instances or also for using the Marketplace platform? Are there any additional costs for hosting/invoking Forge or Connect Apps?
Additionally, I would like to know if it is possible to create a Jira software plugin without using Connect or Forge, and list it on the Marketplace (for example, a web app hosted elsewhere)?