For personal use, I recommend the free and open-source Truecrypt, which comes in flavors for Windows, Mac and Linux.
Cosmoe works on any of the standard filesystems available for Linux.
Success for open source is when the term 'open source' becomes a non-factor in the decision making process, when people hear about Linux and compare it to Windows NT, and they compare it on the feature set and don't have much of an excuse not to use it.
Users and entrepreneurs building new business models off the blockchain means that there are competing interests on how best to scale the network. Linux, also an open source software project, had similar growing pains.
I currently use Ubuntu Linux, on a standalone laptop - it has no Internet connection. I occasionally carry flash memory drives between this machine and the Macs that I use for network surfing and graphics; but I trust my family jewels only to Linux.
Linux evolved in a completely different way. From nearly the beginning, it was rather casually hacked on by huge numbers of volunteers coordinating only through the Internet.
The big problem that is holding back Linux is games. People don't realize how critical games are in driving consumer purchasing behavior. We want to make it as easy as possible for the 2,500 games on Steam to run on Linux as well.
Open source production has shown us that world-class software, like Linux and Mozilla, can be created with neither the bureaucratic structure of the firm nor the incentives of the marketplace as we've known them.
Linux is a complex example of the wisdom of crowds. It's a good example in the sense that it shows you can set people to work in a decentralized way - that is, without anyone really directing their efforts in a particular direction - and still trust that they're going to come up with good answers.
Linux is only free if your time has no value.
