GINTER

Not a replacement per se, however, VLC (a free download) is absolutely amazing. It's simple, small, fast, and renders EVERYTHING with the proper codecs (freecodecs.com).

WinAmp is another alternative, but it's bloated.

Nero comes with its own player, but I don't like it.

PowerDVD is another alternative.

For MOV files (Apple), I would recommend QuicktimeAlternative. It's much smaller than Quicktime and much faster. It's also FREE and free of Apple bloat-code.