Origami is a free web prototyping toolkit for Quartz Composer created and maintained by Facebook. It was initially created to help Facebook designers work on quick prototyping and has been used in developing many of their apps, such as: Instagram, Paper, Messenger, Slingshot, Rooms and Groups.
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Pro Native testing
Developers can develop their prototypes with origami through their desktops, but the testing itself is done on the native devices.
Pro Open source
Origami is free and open source and it is hosted on GitHub.
Pro No code required
Origami is built by designers for designers. As such, it allows for quick prototyping without writing a single line of code.
Pro Powerful animations and interactions
Origami was actually built to help Facebook designers work on Paper, one of Facebook's latest apps. Every animation that is coded into Origami was first made for Paper. It uses powerful 3D effects and some of the most advanced features for scrolling, tapping and swiping to create a faithful and interactive prototype.
Pro Completely free
Origami is offered to the public completely free, no monthly plans, no upfront cost whatsoever.
Con Steep learning curve
Origami is a toolkit for Quartz Composer, and unfortunately the learning curve for it is quite steep. Especially for beginners.
Con Mouse driven interactions
There's no way to directly test the tactile interface.
Con Mac only
Since Origami is not an app in and on itself, but a plugin for Quartz Composer, which is built by Apple. Therefore, Origami is only available for Mac and for a developer to download and use it, they need to register as an Apple Developer.