I'd like to suggest the addition of advertools to your list (a free and open-source Python library and command line tool), maybe under the Tools section.
Some of the SEO functionality it contains:
robots.txt parser and bulk tester
XML sitemap bulk parser
SEO crawler
SEO headers crawler (sending only HEAD requests)
Log file parser, supporting any log format
Bulk SERP analysis by connecting to the custom search API
I'd like to suggest the addition of advertools to your list (a free and open-source Python library and command line tool), maybe under the Tools section.
Some of the SEO functionality it contains:
Full documentation is available here as well