"A team of UConn faculty and staff have developed an open source web application called Sourcery to make it easier to access some of the world’s most sought-after archives and rare collections....
"Crowdsourcing" might be misleading to those who associate the term with fundraising. OP's article, posted in 2016, refers to a NARA initiative that engages the general public to help link data across record groups, primarily through tagging but also through other indexing initiatives going on.
The newest version of Tropy helps researchers share photographs of archival materials:
"Archival Research in a Time of Social Distancing," Tropy blog, March 17, 2020, https://tropy.org/blog/archival-research-in-a-time-of-social-distancing/
History Hub is a useful tool in these days of work from home -- "A support community managed by the National Archives for researchers, citizen historians, archival professionals, and open government advocates," "a crowdsourcing platform ... a place to ask questions, share information, work together, and find people based on their experience and interests. " (About History Hub)