Nightscout (CGM in the Cloud) is an open source, DIY project that allows real time access to a CGM data via personal website, smartwatch viewers, or apps and widgets available for smartphones.

http://www.nightscout.info/

AndroidAPS is an open source app for people living with insulin-dependent diabetes that acts as an artificial pancreas system (APS) on Google Android smartphones. The main components are different openAPS software algorithms which aim to do what a living pancreas does: keeping blood sugar levels within healthy limits by using automated insulin dosing (AID). Additionally, you need at least a supported and FDA/CE approved insulin pump and continuous glucose meter.

https://androidaps.readthedocs.io/

Loop is an app you build and load on an iPhone (or iPod).

After building the Loop app:

• You enter your personal therapy settings (e.g., carbohydrate ratio, basal rates, insulin sensitivity)
• You enter the carbs you eat
• Loop uses this information, your insulin on board (IOB) and glucose data, to determine how much insulin you need to bring your blood glucose within the target range you set
• You can choose to have Loop automatically control insulin dosing (closed-loop mode) or have Loop recommend insulin that you can accept or modify (open-loop mode)
  • Loop requires a compatible continuous glucose monitor (CGM) and a compatible pump for closed-loop operation
  • If you use a compatible Medtronic pump or Eros pods, you will also need a small device for the iPhone and pump to communicate.

https://loopkit.github.io/loopdocs/

A .net project that displays your current glucose values in a floating popup on your windows desktop

https://github.com/dabear/FloatingGlucose/releases

Autotune is a system that recommends changes to your basal rate, insulin:carb ratio and insulin sensitivity factor based on the data recorded in Nightscout.

https://autotuneweb.azurewebsites.net

http://www.runsweet.com/