LogCat 1.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Janusz Bossy. LogCat for Mac lies within Developer Tools, more precisely DB Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
LogCat is a simple ADB logcat viewer written purely in Objective-C. The program includes definable filters for quick access to frequently checked logs. You can filter by message, log type, tag or PID. It provides you the ability to change font color and style for each for different log types.
You may want to check out more Mac applications, such as LogRabbit, which might be similar to LogCat.