Update README.md

README.md

@@ -26,8 +26,8 @@ A community organization for Wikimedians interested in creating, contributing to
 ## Tools
 * [Storm](https://storm.genie.stanford.edu/) (and coming: DataStorm)
 * Citation checkers: 
-** [Alex O]()
-** [hackathon]()
+** [Alex O](https://wiki-cite-checker.replit.app/)
+** [Citation needed](https://chromewebstore.google.com/detail/wikipedia-add-a-fact/kecnjhdipdihkibljeicopdcoinghmhj) chrome extension
 * [WikiChat](https://wikichat.genie.stanford.edu/)
 * [Spinach](https://github.com/stanford-oval/spinach) - SPARQL-based study
 * [WikiCrow](https://wikicrow.ai/) - via [FutureHouse Platform](https://platform.edisonscientific.com/)