Splash is a javascript rendering service with an HTTP API. It's a lightweight browser with an HTTP API, implemented in Python 3 using Twisted and QT5.
It's fast, lightweight and state-less which makes it easy to distribute.
Documentation is available here: https://splash.readthedocs.io/
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.
Commercial support is also available by Scrapinghub.