This category includes computer software that is no longer maintained, like:

• Software that has been officially discontinued by the original developer and is not maintained by any other third party.
• The company that used to maintain it went bankrupt or ceased to exist for a variety of reasons, and no other company is going to maintain it (even if it was not officially discontinued)
• Abandonware

Software not to include in this category:

• Video games, because most video games would otherwise meet the definition above after a short period of time