Flip4Mac
Starting with Version 3, they have introduced audio watermarking so that you now hear "This is a demonstration of Flip4Mac" every few minutes! Very annoying!
Mavericks (MacOS 10.9) Users
To remove the audio watermark, You MUST pay for the "Player Pro" version of Flip4Mac.
Version 2.4 (below) does NOT work on Mavericks.
Pre-Mavericks Users
Do NOT get the latest version of Flip4Mac!
If you have already installed Version 3, please Uninstall it first, then run kJams and go to Preferences->Audio and click "Clear Cache", then quit kJams.
Then, download the FREE Flip4Mac 2.4.4.2, which has NO audio watermark.
After you install Version 2, go to System Preferences->Flip4Mac->Update, and set "Check For Updates" to "Never".