Download of OP.GG Spectate 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is an intellectual property of Genesor. OP.GG Spectate for Mac lies within Games, more precisely Tools.
From the developer:
OP.GG Spectate is an app that launches the League of Legends spectator mode for a specific game using OP.GG spectator files (.bat or .sh files). You need to use this app because Mac OS cannot use .bat files. This drag and drop application has a user friendly interface.
You may want to check out more software for Mac, such as GG Radio : SID + Media Player, Spec Ops: The Line or Sniper Ops 3D - Kill Terror Shooter, which might be similar to OP.GG Spectate.
Utilities
Science Tools