As you may recall, I've been working on a UPDI programmer firmware to run on Arduinos (Arduini?), to facilitate the programming of the new xtiny MCUs. These chips are clearly gaining in popularity and maybe not everyone wants to invest in a Atmel-ICE, even with 50% discount.
The first version was for Atmel Studio but had several drawbacks, it was more of a prototype/hack. But now I have a new one, meant to be used with avrdude, that I think is a lot better.
You can get it here: https://github.com/ElTangas/jtag...
I hope it will be useful for low-budget hobbyists, it sure is useful to myself :)