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Afterburner is the fastest phpBB3 style ever and is completely free. The theme balances speed and search engine optimisation with a full feature set. An assortment of 8 preset styles, both light and dark also accompany the template.
Modestus is fast and elegant phpBB3 style . With Modestus, we combined speed and simplicity, with some of the powerful configuration options. Modestus also features new forum and posts listing.
This is a template in red and silver. It is 100% wide and both HTML and CSS validates without warnings.
This is a very minimalistic style. It has a fixed width of 770 pixels and both the HTML and CSS validates without errors or warnings.