We've covered several Windows Explorer alternatives here on the site, and in general the ones that are free all leave something to be desired. The thing that I really like with NexusFile is that it has many of the features power users want, but without all the clutter that a lot of the other file managers tend to come with.

In Windows you can make connections to FTP clients, but when it comes to connecting to an SFTP server you'll need to turn to a third-party application. Swish tries to bring the missing SFTP integration to Windows Explorer with a fast and free download.