FreeBSD has GEOM/geli, which is a block-level (sub-filesystem) encryption method written by Paweł Jakub Dawidek (a Pole). It allows your choice of several data

FreeBSD has GEOM/geli, which is a block-level (sub-filesystem) encryption method written by Paweł Jakub Dawidek (a Pole). It allows your choice of several data integrity verification algorithms, several encryption algorithms, and the usage of zero or more key files and/or a passphrase. And you can use it on external devices if you like. Also supports hardware acceleration via AES/NI with recent Intel CPUs. Since it's block-level, you can use any filesystem you like. Since it's BSD, you might as well use ZFS (but don't use data integrity verification if you do, since ZFS has that built in.) Downside is that you have to use FreeBSD to get it. Upside is that you get to use FreeBSD =)