some time ago I wrote Spriter player for Phaser engine. It is written in Typescript and here at GitHub is repository: https://github.com/SBCGames/Spriter-Player-for-Phaser. It supports only features from free version, as at time of writing I had only free one.
You can see working sample on my blog here: http://sbcgamesdev.blogspot.cz/2015/09/phaser-tutorial-phaser-and-spriter.html
Beside this I wrote Spriter Minimizer. It is utility to shrink Spriter output (https://github.com/SBCGames/SpriterMinimizer) It is kind of "work in progress", but it can already minimize xml output or convert it into binary. These are output sizes for test anim (grey guy):
346 kb standard, pretty printed, Spriter output,
240 kb Spriter output with pretty printing unchecked,
165 kb after minimization with SpriteMinimizer (with default definitions.xml),
74 kb when converted into binary format with smallOffset switch on.
New version now includes Spriter Pro features:
Currently it can load scml and scon files. Support for minimized files (made with Spriter Minimizer) is temporarily down.