Off-topic, but Eqonomize, software I hadn't come across, had its first release on 2006-07-17! It's amazing how committed people can be to FOSS development.
Wow! Is there no end to the finding of mature accounting software projects one has not heard of!
Eqonomize is a featureful cross platform QT-based GUI accounting app using XML as its data format. It is actively maintained, yet has only 116 github stars (!)
PS Moved this here from the XML thread.
PPS I see that whole thread kicked off with @hledgerfan's discovery of Eqonomize last year. Well here's a new thread highlighting Eqonomize itself. Interop with PTA, anyone ?
Interop with GnuCash would be also interesting to know about, five GnuCash also does XML
I've filed GnuCash XML compatibility? · Issue #197 · Eqonomize/Eqonomize · GitHub to ask about that as the documentation doesn't mention anything about it
Someone also asked for a comparison, in case such a comparison will end up published on PTA website: Are There Any Good Recent Reviews / Comparisons of Eqonomize vs Gnucash, Kmymoney, Etc? · Issue #178 · Eqonomize/Eqonomize · GitHub