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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
https://glacierprotocol.org/ takes things a couple steps further and uses two laptops to make your own cold storage solution, which again is opensourced.
If neither of those appeal to you then my vote would be https://coldcard.com/ because of it's ability to be airgapped.
I'm not a fan of keystone because They're not open source, that github page is a slap in the face lol. Also what is with the fact that their repo is 16.9 Gigs of code? (That DL link at the bottom that just downloads a random tar file). If that's all code, holy crap that's a lot of potential attack vectors lol.
Related posts
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Github repo
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I can't find some components in this schematic.
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Hardware/Software wallets and backdoors implemented by different nations?
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Multisig 2 of 3 for a single person, with all cold wallets as Tails + Electrum? Is it a good idea for safer security? Or just an unnecessary overkill?
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Hardware wallet security