Here are a few websites that offer free to use scripts to enhance your websites/blogs.
Enjoy!
http://www.phpjunkyard.com/
http://www.free-php.net/
http://php.resourceindex.com/Complete_Scripts/
http://www.scriptdungeon.com/php_scripts.php
http://www.hotscripts.com/category/php/
http://www.programmerworld.net/resources/php/php_scripts.php
http://www.zubrag.com/scripts/
http://gscripts.net/
http://www.scripts.com/php-scripts/
http://slodive.com/freebies/download-free-php-scripts/http
http://www.toucanmultimedia.com/download.php
http://www.1stwebdesigner.com/css/web-scripts-download/
http://www.thescriptlibrary.com/Default.asp
http://www.hotscripts.com/
http://www.cgiscript.net/
http://www.perlscriptsjavascripts.com/download.html
