Add module to jira software

[TRAN HOANG LUAN]

I'm starting to learn and use jira, I know Jira is an open source software, so what if I want to add the module I write in jira? Thanks everyone.

[Nic Brough -Adaptavist-]

It absolutely is not open source.

To write apps for it (which is what I assume you mean by "modules") start at https://developer.atlassian.com/server/