It's fast, lightweight and state-less which makes it easy to distribute.
Documentation is available here: http://splash.readthedocs.org/
Using Splash with Scrapy
To use Splash with Scrapy, please refer to the scrapy-splash library.
Open source support is provided here in GitHub. Please create a question issue (ie. issue with "question" label).
Commercial support is also available by Scrapinghub.