Curi + Hickory
In addition to the examples on the Curi documentation site, Glitch (a Twitch.tv clone) provides a good demo of how Curi works.
Foraging is a suite of projects that make it easy to collect data from web pages. With Foraging, rules are made to describe the elements in the page with the desired content and what data to collect from them.
Forager is a Chrome extension that enables a user to create rules by selecting the content in a page that they want to collect for. Forager's UI is built with React and D3.
Granary is a Flask server that communicates with the Forager extension so that users can store their rule sets locally.
Gatherer is a Python package that uses the rule sets created by Forager to actually visit web pages and collect the data.
Cryptonite teaches basic cryptography techniques and provides challenges for users to test their knowledge. The front-end is built with React, while the back-end is built with Django.
More? Check out GitHub.