Magicmirror is a software package for, well, making one of those nifty RaspberryPi magic mirrors that people seem to like building for their houses. Modular; turn on the bits you want, turn off the bits you don't.
This project is a software defined radio receiver for these messages. We make use of an inexpensive rtl-sdr dongle to allow users to non-invasively record and analyze the commodity consumption of their household. Designed with ERT-compatible smart meters i mind.
An open source database developed with IoT devices and quantified self tracking in mind. Has a REST API. Written in Go, has Python bindings. Has a built-in web app for exploring the data. Can be used for personal tracking, too. Seems like it would be a useful database for lightweight tracking of stats.
The github repo of work pertaining to IoT communications and protocols over XMPP instead of other methods or networks. One advantage is that, by using p2p XMPP, devices could communicate with each other.
An online microblogging site for IoT stuff. Publish and subscribe to arbitrary data. Does not require an account to use (strangely), just publish and go. Has a REST API, responds with JSON. Stores one day of data history by default. You need to pay to get more storage. Realtime capable. Can alert on certain conditions. Multiple client libraries, including python modules.
International cellular provider that offers data only SIM cards for iot hackers. You get 1 meg a month of data. They're free to start with but you have to pay shipping. They also offer a device management dashboard for your projects. Entirely self-serve.