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App Icon Template - Royalty free app icon creator for iOS, OS X and Android
Super designer - Super designer is a collections of simple design tools to create unique designs in a a few clicks.
UX Tools - Compare UX design tools side-by-side
Lean Service Creation - Open source design process and toolkit
avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.