If you are managing more than a dozen documents of any type, I strongly suggest a commercial application.
I have used full versions of the software from both Cspec and TWI. Both are very similar in user interface. There are some differences with some form content and database back end.
I strongly suggest you contact both companies and request a demo. I have worked for Cspec before and currently use TWI's software so my opinion may be skewed one way or another.
Also check out
http://www.weldassistant.com/ .
Here is a video showing the creation of a prequalified WPS using the software from Cspec.
http://weldoffice.com/video/pwps/index.htmlThere are also other options using other database applications and building your own (Not for the faint of heart), and some online services.
http://www.thinkcei.com/cei-products/prowrite is another. I have used there demo years ago and didn't care for it however some of these programs change rapidly and some do not. Check it out for yourself.
Gerald Austin
Greeneville Tn