Not open-source, but I trust them because I learned of it from some long-lost forums (which also had hacked printer firmwares to patch out such things), and others had also not experienced any problems. I trust the community far more than the manufacturers (who are certainly doing things against my interests), it reminds me of this:
I did sniff the communications it did with the printer, so I could probably write an open-source version if I really wanted to; but I don't think there's all that much value in doing so.
https://news.ycombinator.com/item?id=13925994
I did sniff the communications it did with the printer, so I could probably write an open-source version if I really wanted to; but I don't think there's all that much value in doing so.
...but someone did think there was, so there's this: https://github.com/lion-simba/reink