Canonical is using it in Ubuntu Unity: http://packages.ubuntu.com/source/trusty/unity-scopes-api http://packages.ubuntu.com/source/trusty/unity-scopes-api The

Canonical is using it in Ubuntu Unity: http://packages.ubuntu.com/source/trusty/unity-scopes-api http://packages.ubuntu.com/source/trusty/unity-scopes-api There is also the OSX text editor, TextMate, which uses Cap'n Proto for some kind of cache file. Sadly, most users don't actually tell me about their experiences, but given the number of people asking questions and filing bugs, I suspect there are many more. The biggest thing holding people back is lack of MSVC support.