Universal Viewer (formerly called ATViewer) is a general-purpose file viewer that supports a wide range of file formats, developed by UVViewSoft from Russia. With its help, you can easily view various common file types without having to download a lot of corresponding software. This not only saves a lot of disk space, but also makes viewing files simpler and more efficient.

PDF-XChange Editor is a PDF reading and editing tool, once known as the smallest (now also becomes a bloated application), fastest and most feature-rich PDF document reader + editor. It focuses on the editing functions of PDF type of electronic documents, and supports many PDF file related editing functionalities such as creating, viewing, editing, annotation, OCR recognition and digital signature.

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.

PDF Shaper is a free and very practical all-in-one type of PDF managing tools box from Spain. Its functions cover almost any aspects of daily PDF files managing operations. Although the inbuilt functions are numerous, it comes with small file size and low system resource occupancy. Plus, because of its intuitive and elegant user interface, users are able to get started with it in no time! In a word, it's a necessary and efficient PDF toolkit.

First of all, as a complete PDF solution, in a way, you can see Soda PDF as one of the best alternatives of Adobe Acrobat (more outstanding and lightweight). Almost every function about PDF you need will be found here!