[drchaos]

There's a in-browser version of LibreOffice being worked on since quite some time (first announcement was in 2011[1]), but there's not much information online about the current status.

They have video[2] and a wiki page[3] which at least shows how to enable it (custom build required):

[1] http://blog.documentfoundation.org/2011/10/14/libreoffice-co...

[2] http://people.gnome.org/~michael/data/2011-10-10-lool-demo.w...

[3] https://wiki.documentfoundation.org/Using_LibreOffice_in_a_W...