This is a list of links to articles on software used to manage Portable Document Format (PDF) documents. The distinction between the various functions is not entirely clear-cut; for example, some viewers allow adding of annotations, signatures, etc. Aloaha PDF Suite ?????? ?? ???? ??? ?????? ? ??? ?????? Aloaha ?? ????. ??? ?????? ? ??? ????? ??????? ? ??????? ?? ?? ??? ????? ???? ? ?????? ???? ??????? PDF ?? ?? ?????