Nuvid
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Nuvid has a reputation for a relatively tidy interface by free-tube standards. The emphasis is on HD content and the player reflects that, defaulting to the highest resolution available without requiring the user to switch manually. Categories are well-labelled and the tag system works for narrowing results.
The library is a step below the biggest tubes in raw volume, but quality is more consistent. No login is required. Mobile streaming is functional, and the site loads fast enough to avoid the buffering complaints common on bandwidth-heavy HD sites.