"Here is the evidence" (website Crowdsourcing the Evidence of 2020 election/voting fraud)
Patrick Byrne's "Deep Capture" work: 2020 election was rigged
Every Legal Vote (see presidential election results with the fraud removed)
Black Box Voting, founded in 2003, is a nonpartisan investigative reporting and public education organization for elections.
My personal StopTheSteal twitter list (180+ related twitter accounts to follow)
Defending the Republic (Sidney Powell's site)
Sidney Powell's 11/25/20 explosive GA/MI election fraud complaints
Fraction Magic - Detailed Vote Rigging Demonstration (24 min; 2016)
https://theredwave.tv/ THE VIDEO DATABASE ON VOTER IRREGULARITIES
Very good Amazon Video: "Kill Chain: The Cyber War on America's Elections" 2020; 91 min
If you have more additions for this list, please let me know via comment/email/etc.