Sleek-kit Clean and Simple Form HTML & CSS. Its well commented mark-up, W3C Validate mark up and Easy to use.All major Browser Supported.Its Bootstrap Grid form pack. Sleek kit is simple, clean and fresh modern form pack hat useful to agency, company , portfolio, etc..
6) Bootstrap Modal Log In for WordPress : ( DEMO | DOWNLOAD )
Modal Log-in for WordPress provides you with a beautiful alternative log-in for your WordPress powered website based on the popular Twitter Boostrap, a front-end toolkit for developing web applications. It supports bootstrap 3 as well.