GOM Media Player
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Full user review
"Once Great Player Isn't Worth It Now"
The player itself is still fine.
Unfortunately, it now has banner ads. Terrible, terrible idea on a video player, especially with VLC out there. Also, tries to get AVG toolbar and hijack your browsers to AVG homepage. Must pay attention during install or update to prevent this. They say you can OPT-OUT, but ethical companies make it where you can OPT-IN during installs. If GOM needs to make money, then charge for a version with more features like every other legit company.
DO NOT reward companies who use these tactics by downloading their programs. Just use VLC - a true open source free product.