Every greek addon on KODI is made by the same developer Twilight, and when I mean everything on KODI I mean Greek Live TV / IPTV, Greek Movies, Greek TV Series, Greek TV Shows, Greek Theater, Greek Kids Movies and Cartoons, Greek Music, Greek Sports, Greek Radio, Greek Subtitles even a Greek Live TV Guide!!!
The main addon, acting as a central hub for the greek KODI addons you need to install is the AliveGR by Twilight aka Twilight0. All the addons are made and / or maintained by Twilight0 as well as the subtitles.gr subs addon for KODI.
The Twilight0 repo: http://alivegr.net/master/ or get it from my repository / URL
For More: https://goo.gl/dbo6IL