Anguilla
Open but only to pre-approved travelers.
https://ivisitanguilla.com/escape/

Antigua
Open
https://covid19.gov.ag/pdf-post/travel-advisory/

Aruba
Open. Options available: take a PCR test upon arrival or provide certified negative test prior to travel.
www.aruba.com/us/traveler-health-requirements

Bahamas
Open with various pre and post entry test requirements.
www.bahamas.com/tourism-reopening

Barbados
Open with restrictions depending on origin of travel
www.visitbarbados.org/covid-19-travel-guidelines-2020

Bonaire
Open to passengers emanating from "low risk" countries with some additional possibilities to arrive through Curaçao.
www.tourismbonaire.com/health-and-safety

British Virgin Islands
Closed. Set to open borders to visitors on 01 December 2020. Protocols still being debated. The website below is not active but it is where the requirements will be posted when they become available.
http://bvigateway.bviaa.com/

Curaçao
Partially open. Travel from High-risk areas not allowed without quarantine and prior approval.
dicardcuracao.com/portal

Dominica
Open with restrictions varying depending on country of origin.
https://discoverdominica.com/travel-advisory-for-dominica

Dominican Republic
Open. Pre-departure COVID test not required.
https://www.godominicanrepublic.com/newsroom/coronavirus/#protocols

Grenada
Open with restrictions varying depending on country of origin.
covid19.gov.gd/travel/

Nevis
Open with prior approval and evolving requirements depending on length of stay.
nevisisland.com/getting-to-nevis/travel-requirements

Puerto Rico
Mostly open with restrictions at the US Federal level for International Travelers in addition to local COVID test requirements.
travelsafe.pr.gov/#travel-requirements

St. Eustatius (Statia)
Open only by prior approval and with quarantine requirements for high risk countries.
www.statiagovernment.com/key-topics/covid-19/travel-policy

St. Kitts
Open with prior approval and evolving requirements depending on length of stay.
www.stkittstourism.kn/travel-advisory-update

St. Lucia
Open with pre-approval and various PCR tests requirements
www.stlucia.org/en/covid-19/

St. Maarten
Open with various pre-arrival requirements.
stmaartenehas.com/travel-requirements/

St. Vincent & the Grenadines
Open with various pre-arrival requirements and segregation after arrival.
www.gov.vc/index.php/visitors/covid-19-protocols

Turks and Caicos
Open only with prior approval and various test and insurance requirements.
travelauthorisation.turksandcaicostourism.com/public/

US Virgin Islands (St. Thomas, St. Croix & St. John)
Mostly open with restrictions at the US Federal level for International Travelers in addition to local COVID test requirements.
usvitravelportal.com/

Great work. Thanks!