Hybrid Core

Hybrid Core is a WordPress theme development framework for creating solid parent themes. It allows theme developers to forget about all the complex functionality and dive straight into coding their theme’s HTML, CSS, and JavaScript.

This framework’s code is completely free and open source. You can use it for creating publicly-downloadable themes, client work, or even a commercial theme business.

Siara

Clean type drive layout – support for Google Analytics, Custom Fonts and twitter feeds.

Thematic

Thematic is a free, open-source, highly extensible, search-engine optimized WordPress Theme Framework featuring 13 widget-ready areas, grid-based layout samples, styling for popular plugins, and a whole community behind it. It’s perfect for beginner bloggers and WordPress development professionals.

Vivarelli

A simple, minimalist, Swiss graphic design inspired portfolio theme.

Graf

Graf beautifully displays your posts in a unique, minimalist grid-based layout.

Indian Flowers

This theme, inspired by vintage Indian batiks and tapestries, exudes grace and sophistication. 6 color palettes are available so you can choose the one to fit your mood, office or season. Built into the theme are our normal treasure trove of customized social networking icons, automagic Twitter hovercards for @usernames and configurable tweet displays, and social bookmarking options on posts. The theme is optimized for readability and includes built-in WordPress post thumbnails, custom nav menu and widgetized sidebar and footer.

Vidlay

Another quality video centric theme built with the modern video blogger in mind by Press75

On Demand

On Demand by Press75. Inspired by Hulu.com, the On Demand theme provides a fully featured Video solution.

Standard Theme

The Standard Theme is in no way basic or ordinary. It is a theme that tries to set an industry standard for content-centric sites and blogs by claiming to be the best-coded WordPress theme ever. This theme is SEO-optimized and has a quick load time, and with plenty of space for ad zones and has Google Analytics integrated into it.

Iridium

RocketTheme’s Iridium is a WordPress 3.0 theme that has six style variations and a ton of widgets out of the box. It’s very graphic and great for sites that need more than a subtle look and feel.