Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
Scrapy - Scrapy | A Fast and Powerful Scraping and Web Crawling Framework
draw.io - Online diagramming application
Apify - Apify is a web scraping and automation platform that can turn any website into an API.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Portia - An open-source visual scraping tool that lets you scrape the web without coding, built by Scrapy...