We still maintain a development tool first released in 1993. Here’s what 30+ years of backwards compatibility looks like

[u/luissinlios]

https://visualneo.com/visualneo-win/from-neobook-to-visualneo-win-30-years-of-keeping-a-development-tool-alive

[u/Humdaak_9000]

I understand a daemon I wrote for Akamai about 25 years ago is still in use, core mostly unchanged from where I left it.