Delphi.org – http://delphi.org
Delphi Worlds – http://delphiworlds.com
Slack Community – http://slack.delphiworlds.com
Rapid Kinetics – https://rapidkinetics.com
Idera Community Site – https://community.idera.com/developer-tools/
Embarcadero Academy – https://www.embarcaderoacademy.com/
LearnDelphi.org – https://www.learndelphi.org/
Brian Long’s Blog – http://blog.blong.com/