I've been looking around for quite some time lately for a Facebook Messenger UI Kit. Since I couldn't find any updated version, similar to the UI we have today, I decided to build one my own. The free kit is not just a design clone, it's actually a well organized Sketch Library as well. It contains icons, colors, components, spacing elements, etc. Will do my very best to update the kit regularly so it stays updated. Feel free to contribute at brandstof.studio. Great work requires collaboration!