I would like to guide my clients and my visitors of this website for the best solutions. You will find here my selection of extensions which are easily qualified by me in the list of this must-have extensions. I believe these extensions will be part of the Joomla! core soon. Thanks to the developers for providing us these extensions!

JCE - Joomla! Content Editor
An advanced, configurable WYSIWYG editor for Joomla!
Download via JCE
No registration required.

XMap
Xmap is a Site map generator component for Joomla and allows you to create a map of your site using the structure of your menus.
Download via J!V Solutions-Vargas
No registration required.

JoomlaStats
JoomlaStats is a USER AWARE statistics component for Joomla. Features: OS, browser, bots/spiders, referrers, last visitors, last bots/spiders, page hits, visitors by country, average visitors/bots, search engines, and keywords.
Developer: Joomlastats.org
Download via Joomla Code
No registration required.

RSForm!Pro
This component allows you to create easily any kind of forms. Support of RSJoomla! team is remarkable fast and helps in short time with success! You need to pay for it very little amount but it saves your valuable time and make your work pleasure. Definitely worth it!
Developer: RSJoomla!
Download via RSForm! Pro
Registration and a very little payment required.