My most important skill in this area is curiousity and willingness to sift through the latest stuff and give it a try. Yes, I even love to do that - I love to switch out tools in my stack if I see something new and think that might make my life easier.
And because of that I can adapt pretty quickly if a job requires a certain library, framework or stack - even if it is not my personal favorite.
In the following section I list some of my latest projects and the technologies I used to create and maintain them. All projects are hosted on GitHub, thus another one of my skills is to work with Git.
Lehm is a command-line file-generator that intends to get out of your way. No coding is required to create templates with variables, but it can also be extended with hooks.
jQAPI was my first successful project. It started back in 2011 when I wasn't happy about the navigation of the official jQuery documentation. So I put together my own navigation for the docs which was, and still is, well received. I re-wrote jQAPI multiple times, the latest version is all JS, before it was glued together with Ruby.
Ther very site you are looking at. As designers re-design their site often, I re-code my site. Already done with Jekyll, Ghost, Harp.js or a custom implementation - you name it. It's one of digital playgrounds.
Ekso is a small Node.js module that lets you
require whole directory structures into an Object. I use it to structure my back-ends, as seen in the Lehm backe-end boilerplate.
Piffle is a little HTML5 audio game that you play with your voice. I've built it in 48 hours for the StaticShowdown hackathon. It won in the category best-solo and scored 2nd place overall.