Arduino
https://www.arduino.cc/

Brasil Mais Digital – Cursos
http://www.brasilmaisdigital.org.br/index.php/pt-br/

CodeIoT
http://codeiot.org.br/

Crystal Dew World
http://crystalmark.info/?lang=en

Dell – Centro de Treinamento
http://www.dell.com/learn/br/pt/brbsdt1/campaigns/treinamento

DistroTest
https://distrotest.net/

DlteC do Brasil
http://site.dltec.com.br

DNS Stuff
http://www.dnsstuff.com/

edX
https://www.edx.org/

EuCapacito
https://eucapacito.com.br/

Fundação Bradesco
http://www.fb.org.br/

FGV online
http://www5.fgv.br/fgvonline/CursosGratuitos.aspx

FIAP X
http://www.fiap.com.br/fiapx/

Geo Location
http://www.ipligence.com/geolocation/

IANA
http://www.iana.org/

International Numbering Plans
http://www.numberingplans.com/

InterNIC
http://www.internic.com/

IPv6
http://ipv6.br/

Khan Academy
https://pt.khanacademy.org/

MAC Address Vendor Lookup
https://macvendors.com/

Microsoft Learn
https://docs.microsoft.com/pt-br/learn/

OpenDNS | Internet Navigation And Security
http://www.opendns.com/

PingTool
http://pingtool.org/

Políticos (Ranking)
https://politicos.org.br/

Portal Educação
http://www.portaleducacao.com.br/

Postmaster
http://www.terra.com.br/postmaster/

Processing
https://processing.org/

Registro.br
http://registro.br/

Segurança da Microsoft
http://www.microsoft.com/pt-br/security/default.aspx

SIMET – Sistema de Medição de Tráfego Internet
https://simet.nic.br/

soundrown
http://soundrown.com/

Tutorials Point
https://www.tutorialspoint.com/

Udemy – Cursos online
https://www.udemy.com/

Veduca
http://veduca.org/

VirusTotal
https://www.virustotal.com/

W3Schools
http://www.w3schools.com/

webhint’s online scanner
https://webhint.io/scanner/

XP Educação
https://www.xpeducacao.com.br/