Professional license, notary and insurance producer lookups. 5 official sources, linked directly to the government site.
State medical board license verification (physicians; often PAs and others): license status, discipline. Link goes to the official agency home page; the lookup is linked from there (direct search URL did not resolve in our check).
State board of nursing license verification. Nursys QuickConfirm (Federal & national group) also covers most states. Link goes to the official agency home page; the lookup is linked from there (direct search URL did not resolve in our check).
State real estate commission licensee search: brokers and salespersons, license status, discipline.
Official notary commission lookup (status, commission number, expiration). Name, city, county, expiration.
Official attorney roll / bar member search: admission, status and discipline. State bar sites are official regulators in many states. Link goes to the official agency home page; the lookup is linked from there (direct search URL did not resolve in our check).