Joomla, formerly known as Mambo, is a popular open source Content Management System (CMS). As with most open source projects, there’s a ton of free tools out there for you to use. We’ve chosen over 30 useful extensions and other tools to make your Joomla life easier. Enjoy.
Extensions
iJoomla.com – Offers a mixture of free and paid extensions for your site.
Joomla-Addons.org – A large selection of free addons for Joomla.
JoomlaEquipment.com – Professionally developed extensions for Joomla.
JoomlaHacks.com – A large collection of free modules and templates for you to use.
JoomlaShowroom.com – Designing extensions for Joomla-based business sites.
JoomlaSpan.com – A selection of paid extensions, and a subscription based monitoring service.
Resources
HowToJoomla.net – A blog dedicated to everything Joomla and offers lots of tricks for advanced features.
Joomla.org – The main home for the open source project with an archive of 2,200 extensions for your install, a forum, a developer area and more.
Joomla-Developer-Resources.com – Tutorials for getting started with your own Joomla Development.
JoomlaBased.com – Submit your site and get reviews and comments.
JoomlaCode.org – A resource site for those looking to develop projects based on the Joomla code.
JoomlaDirectory.co.uk – A UK based directory of all the Joomla resources out there.
JoomLancers.com – A site for people needing special work down on Joomla to find freelancers looking for work.
JoomlaPoweredSites.com – A site for you to submit your Joomla powered site to and receive comments and reviews from users.
JoomlaSpots.com – Submit your Joomla based site to this directory to get yourself more exposure.
JoomlaTribune.com – Bringing together news and resources from all over the Joomla community.
JoomlaTutorials.com – A large selection of tutorials from installing to adding extensions.
JoomlaZone.net – A site with the aim of bringing all Joomla sites together in one easily accessible reference directory.
Templates
CompassDesigns.net – Professional template designers with ready made solutions. Also offers free tutorials.
Gavick.com – A European based designer of professional templates with a small selection of free ones.
IbolDesign.com – A collection of free Joomla templates for your use.
Joomla-Themes.co.uk – News and reviews on all the latest themes out in the Joomla world.
Joomlart.com – A template club where you get 40 templates right away, and 2 per month for the next year. Does have a few free templates, and a forum.
JoomlaJet.com – A Joomla theme club with 50 themes already in their backstock.
JoomlaJunkie.com – A professional template design company that likes to focus on color. Offers a small selection of free templates.
JoomlaShack.com – Offers up a small selection of free templates and more you can buy. Also has tutorials and a forum.
PixelParadise.com – Offers over 60 pay for template designs.
RocketTheme.com – Another template club that offers you 45 templates at sign up and 1 per month for a year. Offers a small selection of free templates.
Shape5.com – Offers a mixture of paid for and free templates & modules.
SiteGround Joomla Templates – Well known web host offering over 50 free Joomla templates.
YouJoomla.com – Joomla templates for business style sites. (via)