HereHere are a few Check your ballot resources. Please contribute more to the thread.

Alabama https://myinfo.alabamavotes.gov/voterview

Alaska https://myvoterinformation.alaska.gov/

Arizona https://my.arizona.vote/AbsenteeTracker.aspx

Arkansas https://www.voterview.ar-nova.org/voterview

California https://california.ballottrax.net/voter/

Colorado https://colorado.ballottrax.net/voter/

Connecticutj https://portaldir.ct.gov/sots/LookUp.aspx

Delaware https://ivote.de.gov/voterview

Georgia https://www.mvp.sos.ga.gov/MVP/mvp.do

Maine https://apps.web.maine.gov/cgi-bin/online/AbsenteeBallot/ballot_status.pl

North Carolina https://northcarolina.ballottrax.net/voter/

Meck, North Carolina https://www.mecknc.gov/BOE/Pages/DID%20MY%20VOTE%20COUNT.aspx

New Hampshire https://app.sos.nh.gov/Public/AbsenteeBallot.aspx

Pennsylvania https://www.pavoterservices.pa.gov/pages/ballottracking.aspx

Vermont https://mvp.vermont.gov/

Virginia https://www.elections.virginia.gov/citizen-portal/

Washington https://voter.votewa.gov/WhereToVote.aspx

West Virginia https://voter.votewa.gov/WhereToVote.aspx

Wisconsin https://myvote.wi.gov/en-US/MyVoterInfo

More (Source for most if the above) https://www.the-sun.com/news/1746107/2020-election-checking-counted-votes-states-election/