Hi,
You didn't mention in specs what kind of plugins you required. It would be more helpful if you give their brief description. We are expert at developing wordpress plugins and following is a list of few of many wordpress plugins we have developed;
1) Wordpress Plugin which share posts on the Facebook wall of the users as well as on the wordpress website. It has the admin area and public area.
2) Widget for footnote like wikipedia
3) Price calculation for hotel accommodation
4) Wordpress custom search plugin
5) PDF exporter plugin for wordpress
6) Wordpress plugin for creating fixed position tables using H2 Tags
7) Plugin for restricting comments and posts per page in wordpress
8) Personalization of IDs of pages in address bar
9) Wordpress plugin for adding custom fields to wordpress dynamically
10) Plugin to convert wordpress posts into slideshow videos
Looking forward to hear from you.
Best Regards,
Kashif