- Investigations
	-   [411 (US)](https://www.411.com/)
	-   [Alumni.net](https://www.alumni.net/)
	-   [Ancestry](https://www.ancestry.com/)
	-   [Charlie App](https://charlieapp.com/)
	-   [CrunchBase](https://www.crunchbase.com/)
	-   [Data 24-7](https://www.data24-7.com/)
	-   [Family Search](https://familysearch.org/)
	-   [Fold3 (US Military Records)](https://www.fold3.com/)
	-   [Forebears](https://forebears.io/)
	-   [Genealogy Bank](https://www.genealogybank.com/)
	-   [Kompass](https://www.kompass.com/)
	-   [MelissaDATA](https://www.melissadata.com/lookups/peoplefinder.asp)
	-   [The National Archives (UK)](https://www.nationalarchives.gov.uk/)
	-   [PeekYou](https://www.peekyou.com/)
	-   [People Search (Australia)](https://www.peoplesearch.com.au/)
	-   [Pipl](https://pipl.com/)
	-   [Recruitem](https://recruitin.net/)
	-   [Rootsweb](https://home.rootsweb.ancestry.com/)
	-   [SearchBug](https://www.searchbug.com/)
	-   [Skip Ease](https://www.skipease.com/)
	-   [SnoopStation](https://snoopstation.com/)
	-   [Spokeo](https://www.spokeo.com/)
	-   [That’sThem](https://thatsthem.com/)
	-   [USSearch](https://www.ussearch.com/)
	-   [Zabasearch](https://www.zabasearch.com/)

- Emails
	-   [Email Address Validator](https://www.email-validator.net/)
	-   [Email Format](https://email-format.com/)
	-   [EmailHippo](https://tools.verifyemailaddress.io/)
	-   [Email Hunter](https://emailhunter.co/)
	-   [Have I Been Pwned](https://haveibeenpwned.com/)
	-   [MailTester](https://mailtester.com/testmail.php)
	-   [Pipl](https://pipl.com/)
	-   [TCIPUTILS.com Email Test](https://www.tcpiputils.com/email-test)
	-   [ThatsThem](https://thatsthem.com/reverse-email-lookup)
	-   [Verify Email](https://verify-email.org/)
	-   [VoilaNorbert](https://www.voilanorbert.com/)

- Expert Search
	-   [Academia](https://academia.edu/)
	-   [CanLaw](https://www.canlaw.com/)
	-   [ExpertiseFinder](https://www.expertisefinder.com/)
	-   [ExpertGuide](https://www.expertguide.com.au/)
	-   [ExpertPages](https://expertpages.com/)
	-   [Experts.com](https://www.experts.com/)
	-   [HARO](https://www.helpareporter.com/)
	-   [Idealist](https://www.idealist.org/)
	-   [Maven](https://www.maven.co/)
	-   [MuckRack](https://muckrack.com/)
	-   [National Speakers Association](https://www.nsaspeaker.org/)
	-   [Newswise](https://www.newswise.com/)
	-   [PRNewswire](https://prnmedia.prnewswire.com/)
	-   [ReseacherID](https://www.researcherid.com/)
	-   [Speakezee](https://www.speakezee.org/)
	-   [Sources](https://www.sources.com/)
	-   [Zintro](https://www.zintro.com/)