Many of these scholarships and fellowships have early fall deadlines for funding for the 25 /26 academic year, and these early deadlines can catch students off guard!
At the moment, PathwaysToScience.org has over 65 portable scholarships and fellowships posted on the site, all within STEM:
https://www.pathwaystoscience.org/programs.aspx?u=&r=&s=&sa=either&p=YesPortable&o=either&c=either&f=&dd=&ft=&submit=y&adv=adv
Undergraduate scholarships and resources for applying: https://pathwaystoscience.org/Undergrads.aspx
Graduate fellowships and resources for applying: https://pathwaystoscience.org/Grad.aspx
Postdoctoral fellowships and postdoc positions: https://pathwaystoscience.org/Postdocs_Portal.aspx
A quick video tutorial on using our advanced search functions to find funding opportunities: https://www.youtube.com/watch?v=FxKsAGk8dAw&t=16s