There are 172 hooks for ExpressionEngine development. You can view this same list at the official landing page for the hooks in the EE developer docs. Viewing any hook's page will show every add-on known to use that hook.
Those "most favorite" add-ons. Check them out and see why so many people like ‘em.
The crème de la crème.
MD Dulee Noted (Extension - 1 rating)
Sarge (Extension - 1 rating)
BN Short Name (Extension - 1 rating)
PD Fileformat (Plugin - 1 rating)
Cookie Plus (Plugin - 1 rating)
REEgion Select for FieldFrame (Fieldtype - 2 ratings)
Paragraph to BR (Plugin - 1 rating)
Amazon Web Services (AWS) Products (Plugin - 2 ratings)
Downloader (Plugin - 1 rating)
Absolute Total Results (Extension - 1 rating)
Masuga Design is a small web design and development studio that has constructed and implemented effective, usable, standards-compliant and visually appealing sites for Fortune 1000 companies as well as sites of modest scope for enterprising individuals.
Almost 100% of Masuga Design’s development work utilizes the ExpressionEngine CMS, and they are a member of the ExpressionEngine Pro Network.
Masuga Design specializes in jQuery, User Interface (UI), Information Architecture (IA), Photoshop, CSS, and XHTML.
ExpressionEngine is the flexible publishing system to which devot:ee is…devoted. We love it, and if you’re a regular visitor to this site, we can guarantee you love it, too.
ExpressionEngine has been updated to 2.0, built on CodeIgniter, although the 1.6.x branch is still available, and in wide use.
Newism is a Newcastle Australia based web design and development company. We design beautiful, functional and accessible websites and blogs, that all adhere to Web Standards and utilise the latest Web 2.0 technologies.
We use open-source content management and blogging systems like ExpressionEngine and Wordpress, and work with small to medium tech-savvy businesses, through to large multi-nationals.
Newism are one of the most prolific producers of ExpressionEngine extensions in the industry, and are proud members of the ExpressionEngine Pro Network.
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Our staff are friendly people whose goal is to make your hosting with EngineHosting the best experience possible.
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EllisLab is the company responsible for ExpressionEngine and the CodeIgniter PHP framework, upon which ExpressionEngine 2.0 is built.