Teleceptor is an open-source data server for the Internet of Things. It is written in Python and runs on Rasbery Pi, Beaglebone Black, or a PC. Teleceptor can communicate with a variety of sensors over serial and WiFi. It isn't a cloud service that you have to pay for and it doesn't require internet access to run! We make compatible sensors or you can create your own using Teleceptor's open API.
Teleceptor is hosted on GitHub here and will soon be released on PyPy.