Gadgets are small applications that can be added to JIRA to help you track tasks, bugs, projects, and other items in JIRA.
Gadgets are created and managed by users. They are not managed by JIRA.
Gadgets are not visible in the JIRA interface. They are managed through the JIRA REST API.
Gadgets are not a replacement for other tools in JIRA. They are complementary to them.
Gadgets are not meant to be used as a replacement for the JIRA interface. They are meant to be used in addition to the JIRA interface.