Hologram - Frontend Development and Design
tota11y - An accessibility visualization toolkit from Khan Academy
CleanMyMac X - Clean, protect and speed up your Mac
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
Page Speaker - Modern web accessibility tools for agencies & webmasters