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Libreboot – HP EliteBook 820 G2 support added to Libreboot!
(libreboot.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
I doubt this is fully "free" like the X200, but this is still a major improvement. If anything, at least it won't have Intel ME built-in.