CarlBettis.com

digital.library.upenn.edu - Starts before Margaret Cavendish, with Lady Mary Wroth.

library.sdsu.edu - Most well-known science fiction/fantasy authors are men but women have been contributing to the science fiction/fantasy genre since the 17th century.

search.marginalia.nu - This is an independent DIY search engine that focuses on non-commercial content, and attempts to show you sites you perhaps weren't aware of in favor of the sort of sites you probably already knew existed.

sadgrl.online - Sadgrl's Layout Builder

https://www.textetc.com/ - Poetry craft and theory: creation, analysis and improvement.

languageisavirus.com - Cure writer's block with writing prompts, exercises, generators & gizmos

zinewiki.com - ZineWiki is an open-source encyclopedia devoted to zines and independent media. It covers the history, production, distribution and culture of the small press.

https://gotopoem.com/ - GOTOPoem stands at the intersection of poetry, word art and technology.

https://gmicol.greyc.fr/ - The G'MIC plugin filters for GIMP image processing software, in an online interface! Can't tell you how excited I was to find this.