I’ve looked to some different FTP manager for OS X in the latest days and the tool of choice for me has been… FileZilla!!!
The reason it’s very simple: I do not search a complex tool or something very well integrated on Os X with a lot of bell and whistles but something easy to work and that allow a quick way to edit the file of my web server via FTP. Filezilla does all this, it’s free, works very well and it’s available on multiple platforms. As an Open Source tool it’s very well managed, with frequent upgrades, auto updates when you start it and it has a very good management of the different options of FTP.