Haihaisoft PDF Reader - Haihaisoft PDF Reader is the name of a free to use PDF reader and printer that is extremely simple to launch.
Documize - Enterprise-grade wiki and knowledge management platform
Altarsoft PDF Reader - Altarsoft PDF Reader is a simple to use PDF files management program that allows its users to view PDF files, encrypt the files and even annotate these files as well.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
Cool PDF Reader - Just like its name Cool PDF Reader, this small PDF reader is a really a cool PDF reader for viewing, reading and editing PDF files for free.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.