NoFlo (GitHub: noflo) is a project to bring a visual-based approach to programming. It currently focuses on Node, but the authors want to branch out to other platforms if you give them enough money.
The project and the site seem interesting enough, but the Kickstarter video comes off a little bit too enthusiastic. Here is a spoonfull of delicious hyperbole for you to digest: "Nothing new has really been invented in programming in the last 50 years", "code starts as whiteboards", "flow-based programming can eliminate spaghetti code".
The assumption that we use whiteboards perplexes me. I don't think I've used a whiteboard once in my career, and I've been programming commercially for 12 years now. How can making tangled masses of diagrams be a solution to spaghetti code? Won't we just end up with spaghetti diagrams?
NoFlo has been written in CoffeeScript for simplicity.
Oh, OK... Before I give up and post that Grandpa Simpson hat gif, I'll say this: I'm not sold on the idea, but that doesn't mean I won't try it. Let's set aside the hilariously hyperbolic marketing video and see what it can do.
Peppy (GitHub: jdonaghue / Peppy, License: FreeBSD) by James Donaghue is a CSS selector engine. He originally wrote it over four years ago, and it was well known at the time for being fast. He's recently rewritten it with a different focus:
Peppy no longer uses large regular expressions for parsing selector strings. It now uses a selector parser that I wrote called LLSelectorParser. This is a top down parser that returns an abstract syntax tree. Peppy internally now works off of this tree.
Back when I regularly wrote the Let's Make a Framework posts I was fascinated by how CSS frameworks work. Things have changed since then, but parsing selectors is still an interesting topic. Check out LLSelectorParser if you want to see how James implemented his.