iTube Converter for Mac
iTube Studio by Aimersoft is a very good YouTube to MP4 software to try out. It allows users to download, convert, record, etc. with URL and an extension plugin. What it lacks, however, is complete automation and integration. The trial version has quite a few limitations (e.g. it limits the conversion to 1/3 of the file length). The paid version may prove quite costly for some users. It comes at $24.95 per Mac per year or $34.95 for a lifetime license (vs. $19 or $29 respectively for PC).