A couple of items useful in Datacenter situations:
- AirConsole: portable, battery powered, RS232 Serial over WIFI and Bluetooth Adaptor. Designed to be seamlessly used with Mobile Apps on iOS, Android and also on PC, MAC OSX and Linux, Airconsole provides flexible and convenient access to physical Serial and Ethernet ports from devices (such as iPads and iPhones) that have only WIFI network interfaces.
- Lantronix Spider: provides secure KVM (keyboard, video, mouse) server management over an IP network. Spiders can be easily daisy-chained together. Serial administration console port (RS-232) supports Telnet and SSH tunneling to a server COM port. Does not require an external power supply.