[v2.5] PDF-XChange Viewer – Small, very fast and feature-rich PDF reader

For programs with the same functionality, the smaller, faster ones are always more popular. If Foxit Reader ended Adobe Reader's future relying on its smaller file size and faster running speed, then PDF-XChange Viewer is considered to be the killer of Foxit Reader for the same reason. Namely, there is another PDF reader/viewer available now which is smaller, faster and more feature-rich than Foxit Reader.