Need a good video downloader

I have been downloading videos off of youtube for a while and other sites as well. However my two favorite apps (Tooble & Tube TV) decided to spaz out and not work. Tube TV keeps putting the audio and video out of sync when it converts the video and Tooble just won't download anything anymore. I have tried updating and re-installing and nothing seems to work. So What I am asking is if anyone knows of a good video downloader for Mac OS 10.5.7 (That is FREE!!!!) please let me know what it is because I really need a new one.