[Thanks to Mr. Wong Chun Fung for providing this very valuable information!]
Most guqin scores I have seen published in books were hand written.
Here's a software which can be used to neatly type tablature score notation for guqin. A video demo can be seen at http://www.demohour.com/projects/321694#ui_favorite_tips
The software itself can be downloaded from http://www.ppfeng.com/thread-35877-1-1.html