The Swiss Army Knife of all file explorers that is free to download and use.
Ranked in these QuestionsQuestion Ranking
Pro Built-in ZIP and RAR support
ES File Explorer supports the .zip and .rar compression formats.
Pro Integrates with a wide variety of services
The app supports Dropbox, Box.net, Sugarsync, Google Drive, SkyDrive, Amazon S3, Yandex and more.
Pro Supports SMB
ES File Explorer supports a local Samba connection to browse files on other area connected devices.
Con Adds possible malware
Con Connects to an IP in China
For some reason ES File Explorer installs a folder called Baidu of which any app that installs this folder connects to an IP in China for some reason. Sadly it is still not known at this time for what or why.
Interface is kind of crappy.
Con Closed source (proprietary)
The source code for ES File Explorer is closed source.