I'm semi-retired. I have a part-time contract maintaining a system I worked on a few years ago and I pick up other bits of freelance work from time to time.
And I've been prototyping a few project ideas (in Perl) to see if any of them could be a sustainable source of passive income. Of course, if any of them grow to the extent that they need a development team, I'll need to rewrite them in a more sustainable language.
