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I am using an app called Infradog ( Both Android and iOS). I have tried many apps but this one maybe the ONLy app doesn't need additional VPN ( it needs a Management Point installed in your network).
It support Windows, Active Directory, VMware, IPMI..... for monitoring and remote access.
The cool feature for AD managment is it support to upload your employee photo on mobile ( capture live photo on phone camera)
Active Directory Video: http://www.youtube.com/watch?v=RXh2pW73n8c&feature=youtu.be
This app also support Dell DRAC / HP iLO/ IBM RSA through IPMI so I use it for turn-on/off my server on mobile too.