AxCrypt seems quite good nowadays.
though TrueCrypt which forked into VeraCrypt is the open source one most people use.
There is a nice grid of options, and there are many here:
Quote:
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https://en.m.wikipedia.org/wiki/Comparison_of_disk_encryption_software
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It's an interesting topic in itself, I was mostly thinking about the TPM aspects BitLocker chose to rely upon. This thread had caught a venereal disease but it turns out to have been curable, kudos to our founder.