simplify-search is a custom search solution for your site [BTW google already has one to offer ;)]. built on top of lucene. simplify-search is designed to index and search all the pages (both static and dynamically generated) of your site which you wish. the "context" of users' query can be predefined. results are laid out in the way you would configure it. like all "beautiful" code on the internet, simplify-search is FREE but a stable version is yet to be made public. you can try it out for my site though.
burrp! local search widget is an easy way of allowing users on your site/blog to search for select categories of local data for select cities in which burrp! is live in. if you haven't tried the product yet, follow this link. a boring documentation is for this widget can be found here, but i have more than that to offer - a FREE combo plugin for this widget which will display the most searched and latest searches on your site.
simplify-store is a FREE web-based store management tool for any kind of product selling site. The admin interface for this site, which also happens to be the data entry tool is backed by a robust PHP-MySQL backend. simplify-store is packaged with a neat and 100% customizable UI. and yes, how did can i miss this one - the product also has an ultra-cool session based AJAX shopping cart which allows users to add/edit/delete products from their cart and submit it to site admin.
simplify-timesheet is a FREE web-based timesheet management application for small/medium scale enterprises. the product comes with 4 pre-defined roles that for a user. users can fill in their daily work details in the system and send auto generated reports to an incharge 1 level up in the hierarchy. the activity menu for a user is decided by his/her login. the product is PHP/MySQL based and requires PEAR-DB support for PHP.