ISCG 05 is a chain guide mounting standard used throughout the bike industry. The standard uses three bolt holes placed around the drive side bottom bracket shell of the bike that are spaced in a specific orientation.
For manufacturers that follow the standard, it is great because the same chain guide will fit their bikes.
We don't have an exhaustive list of manufacturers or frames that specifically do or don't follow this standard, but we have a partial list here.
To confirm that your frame is ISCG 05 compatible, we have a template you can print out to verify that can be found here.
Note:
There is an older version of ISCG (ISCG OLD) that is no longer common. The chain guide mounting locations on ISCG OLD are closer together than those of ISCG 05.