OpenDHT is a lightweight C++17 Distributed Hash Table implementation.

This provides a convenient API for generating per-user self-signed root certificates, is useful for development.

ORFEO Toolbox (OTB) is distributed as an open source library of image processing algorithms. OTB is based on the medical image processing library ITK and offers particular functionalities for remote sensing image processing in general and for high spatial resolution images in particular.

The Official API Spec Language for Dropbox. Define an API once in Stone. Use backends, i.e. code generators, to translate your specification into objects and functions in the programming languages of your choice.

Django used to include a comments framework; since Django 1.6 it's been separated to a separate project. This framework can be used to attach comments to any model, so you can use it for comments on blog entries, photos, book chapters, or anything else.

The 1-Wire bus is a cheap low-speed bus for devices like weather sensors, access control, etc. It can be attached to your system via serial, USB, I2C, and other interfaces.