Juxta is an open-source tool for comparing and collating multiple witnesses to a single textual work. Originally designed to aid scholars and editors examine the history of a text from manuscript to print versions, Juxta offers a number of possibilities for humanities computing and textual scholarship. It has been developed both as a web application and as standalone desktop.

Visit the official Juxta website 

Juxta is also available on Twitter.  Follow it: @juxtacommons.