This free app turns your Android device into one of 10 different kinds of servers:

DLNA, DNS, DDNS, Email, FTP, Proxy, SMS, Time, Web and/or WebDAV server!

Run your own free DLNA, DNS, Dynamic DNS, Email, FTP(S), Proxy, SMS Gateway, Time, HTTP(S) and/or (secure) WebDAV server

It can even run different services concurrently.

Servers Ultimate – Android Apps on Google Play.