1. alzip (http://www.altools.co.kr/)

it’s good for managing compress files

2. alsong (http://www.altools.co.kr/)

it can be used for subtiltes for songs

3. honey view(http://www.kippler.com/win/honeyview3/)

to read books conveniently, especially if the extension is .zip files and it also supports for simple edit feature

4. foxit reader (http://www.foxitsoftware.com/)

it is useful to read multiple pdf files, it opens pdf files on multiple tabs in an application

5. avast (http://www.avast.com/)

wonderful tools to protect system and it’s free.