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Unsorted links
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- https://www.messpc.de/

- https://pimatic.org/
- http://www.freedomotic.com/

- Very Simple Control Protocol
  An open and free framework/protocol for IoT/m2m automation tasks
  http://www.vscp.org/

- Gweet: Messaging for your things
  https://www.stavros.io/posts/messaging-for-your-things/
  https://github.com/skorokithakis/gweet

- http://dweet.io/
- A Simple Python client for Dweet.io
  https://github.com/paddycarey/dweepy

- http://buglabs.net/
- https://freeboard.io/
- https://alternativeto.net/software/dweet-io/
- https://alternativeto.net/software/dweet-io/?license=free
- https://github.com/r0ehre/DweetSharp
- https://www.linux.com/news/21-open-source-projects-iot

Global Sensor Networks
- https://github.com/topics/sensor-network

- IO-Link
  - https://io-link.com/
  - https://www.hydac.com.au/io-link-digital-communication-interface.html