Use this for Apps/Scripts/Libraries/APIs that:
- Require/use obsolete API's. EG: Stack Exchange API version 1.0
- Operate on/for sites or features that no longer exist.
- Have websites and/or source-code that has disappeared and is not salvageable.
- That the owner/developer otherwise indicates is obsolete and/or serviceable.
See also: What should we do about dead listings?