Jaan Tallinn, Estonian computer programmer, co-developed Skype

Jaan Tallinn is an Estonian computer programmer and investor known for his participation in the development of Skype and file-sharing application FastTrack/Kazaa.

Skype was a proprietary telecommunications application operated by Skype Technologies, a division of Microsoft, best known for IP-based videotelephony, videoconferencing and voice calls. It also had instant messaging, file transfer, debit-based calls to landline and mobile telephones, and other features. It was available on various desktop, mobile, and video game console platforms.