Here is a collection of WordPress Theme Framework’s both Free and Subscription based to get your blog looking more professional. I’ll only be dealing with SEO optimised framework’s.
Free Theme Framework’s
WonderFlux
Website: http://wonderflux.com/
Relative newcomer to the Theme Framework scene, just moved to v1.0RC3
Same open source GPLv2 license code as WordPress
Thematic
Website: http://themeshaper.com/thematic/
Has child themes available for download
Whiteboard
Website: http://whiteboardframework.com/
Gantry by RocketTheme
Website: http://www.gantry-framework.org/
Functions very differently from any other theme I’ve seen.
Paid for / Subscription Theme Frameworks
Warp Framework from yootheme
Website: http://www.yootheme.com/themes/warp-framework
They have a free theme called Master
Basic: 39Euro, 1 site, 3 months of upgrades
Standard: 79Euro, 3 sites, 12 months of upgrades
Developer: 249Euro, Unlimited sites, 12 months of upgrades
Thesis
Website: http://diythemes.com/
Theseis Basic: $87 license for a single site, 12 months of upgrades
Thesis Basic Plus: $164 unlimited sites that you own, 12 months of upgrades
Thesis Professional: $197 unlimited upgrades
Themeframe
Website: http://themeframe.com/
From the author of Atahualpa, a hugely popular WordPress Theme.
$60 Lifetime License, Upgrades for a year, Unlimited Sites
[I’m a bit confused on this one, Lifetime License but only with upgrades for a year?!]
Genesis
Website: http://www.studiopress.com/themes/genesis
$59.95 onetime fee, unlimited sites, unlimited updates
Pagelines
Website: http://www.pagelines.com/pricing/
$139-239 Framework only
Theme Library’s Repositories
Themify
Website: http://themify.me/
$150 for all themes
http://www.webdesignerdepot.com/2011/10/a-comparison-of-leading-wordpress-theme-frameworks/
http://www.1stwebdesigner.com/wordpress/wordpress-theme-frameworks-and-starting-resources/