Here is everything you need to know about using PDF-XChange Editor legally for free, versus when you actually need a license. 1. The "Free Version" (Evaluation Mode)
Based on user consensus and expert evaluations, PDF-XChange Editor is highly regarded as a faster, more lightweight alternative to Adobe Acrobat. Downloads for PDF-XChange Editor
The software is designed so that roughly are available for free without a license.
Tracker Software (the developers) offers up to 50% off for registered charities and academic institutions.