The source code for Amazon's Lumberyard is now available on Github, allowing you to forego the use of its bulky installer.
It's nice to see the user feedback being addressed by the Lumberyard dev team. You can find the source here
Source: https://www.dsogaming.com/news/amazons-lumberyard-engine-source-code-is-now-available-on-github/
SpeedTree® 8 for Lumberyard has been released under a free license provided by Amazon to all Lumberyard developers.
SpeedTree is a procedural 3D modeling tool that is primarily used for generating forests. Once in a while, someone gets creative and uses it for underwater vegetation but for now...expect more Amazon forests.
Source: http://store.speedtree.com/speedtree-for-lumberyard/