Word for software which has been killed or is no longer supported

It depends on your precise meaning, and the intended audience.

It could mean ending:

• Feature updates

• Non-security bug fixes

• Security fixes

• Customer support / troubleshooting

• Service, in the case of SaaS (software as a service)

Sometimes there will be different dates for ending each of these.

For a general-use single-word verb to mirror released, I suggest discontinued. That is, releases, support, etc. (whatever it is that you mean) are no longer continuing.

But I would prefer end of life, which though not a single word (unless you count end-of-life or EOL) is a common industry term, and usually denotes an end to updates or fixes. This is, for example, what the operating system Ubuntu uses: "Release date" and "End of life date".

Some other possibilities:

• abandoned - implies the ending was unplanned

• deactivated / defunct - accurate if the software is actually no longer functioning

• decommissioned / retired - might work, though I would use this for when something actually stops being used, as when a particular company, user, or specific system is no longer using it

• deprecated - describes software as replaced, or not officially recommended. This precedes its complete removal. This term is not widely used outside of software libraries (and software developers).

• obsolete - not great, as it describes the need or use for the software, not the state of development or support; software can become practically obsolete long before any planned support date

• sunsetted - a sunset is actually a period of time of limited support, so it doesn't fit a single date as you have requested. This term is frequently used, e.g. Google Reader

• terminated - good, though if you didn't like killed, this might also be too strong

• unsupported - good, though not all software is ever "supported" in the way some may think: regular bug fixes, support staff, etc.

Deprecated is often used to describe lower-level APIs/function/libraries that should not be used going forward. See wikipedia on software deprecation.

Use end-of-life; that's standard in the industry, in my experience.

Different people use different things here, so which term below would work best in your specific situation is going to vary depending on your intended use of it.

• decommissioned
• uninstalled
• discontinued
• deactivated
• shut down / shut off
• deleted
• retired
• retired from service
• became unsupported
• passed its contractual end-of-life cut-off date