Overall Rules

Follow the format as much as possible
If you want to introduce a new category create an issue or discussion first
When removing links, migrate them the obsolete.md page in a pull request
One addition per pull request unless it's unreasonable to do so
You're welcome to suggest changes anywhere using PRs, however they are seen as suggestions and not commitments

Apps

Include the vendors website as the link on the name, then include locations you can get it afterwards
Verify the links
Ensure that the application runs

Communities

Communities must either be large, or have sustained activity over a long period of time

Youtube

Rules will adapt over time, current strong preference for older content and content relating to academic material