I have a $25/year subscription to fastmail that's pretty much the only thing I pay for.
Discussion
fiat only rest assured #btcfail
Btw not that I'm stingy, I have a budget of $300/month (= $3600/year) just for infrastructure (cloud hosting, internet access) just for my non-commercial pet projects. But that's infrastructure, not software.
Fastmail too isn't even pure "software" as their service includes hosting (SMTP/IMAP) and a web client.