I came across this reference ... The link does work for me it is a pdf file. I just varified it.
http://library.fishbreeder.net/xoopsdocs/xoops-essential-modules.pdf'''Summary of Essential Modules'''
(1.Function, 2.Suggested module, Version, Official support site, 3.Comments)*News
**News 1.53 (1.55) http://xoops.instant-zero.com ***Display and archive news articles, generate RSS feeds.
*Downloads
**WF-Downloads 3.1 (3.2) http://www.smartfactory.ca ***Display and categorise downloadable files on your site.
*Forums
**CBB 3.08 https://xoops.org.cn/modules/wfdownloads/singlefile.php?cid=8&lid=556 ***Requires installation of Frameworks
https://xoops.org.cn/uploads/mydownloads/xoops/xoops-frameworks-art.zip <<--Download Link.
***Requires XooPS Editors
https://xoops.org.cn/uploads/mydownloads/xoops/xoops-class-xoopseditor.zip <<--Download Link
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***Community forum/discussion board.
See additional thread*Polls/voting
**Polls 1 https://xoops.org ***Allow users to vote on different issues and display results. CBB links to this module for poll functionality.
*FAQ
**Smart FAQ 1.08 http://www.smartfactory.ca ***Advanced FAQ module. Allows users to submit and answer questions.
*Links
**My Links 1 https://xoops.org ***Display and categorise links to other sites.
*Partners
**Smart Partner 1.02 (1.04) http://www.smartfactory.ca ***Display a page for each partner of your site, as well as a block for their links and logos.
*Static HTML pages
**TinyD 2.25 http://xoops.peak.ne.jp ***Create or wrap HTML pages within XOOPS. Cloneable, up to 10 instances can be installed.
*Calendar
**eXtCal 2.04 http://www.zoullou.net/ ***Display and categorise events, multiple views.
*Photo gallery
**eXtGal 1.01 http://www.zoullou.net/ ***Full-featured photogallery with optional lightbox hack (installed separately).
*Membership
**Xoops Members 1 https://xoops.org ***Allow visitors to search the details of members of your site.
*Contact form
**Contact Us 1 https://xoops.org ***Simple contact form that emails submissions to the adminstrator.
*Custom menus
**Multimenu 1.82 https://xoops.org ***Create custom menus and display them in many formats.
*Security
**Protector 3.02 http://xoops.peak.ne.jp ***Guards and logs against a range of security threats including SQL injection and brute force attacks. Provides advisories on securing your site. Minor hacking of files required to install. Ensure that you follow the installation instructions in the readme step by step.
____________________
*Database management
**PHPMyAdmin 2.51
https://xoops.org ***Provides a graphic user interface that allows easy manipulation of MySQL databases.
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*Other stuff
**Frameworks See Above
***Frameworks is not a module. It is a collection of common tools that must be installed before certain modules will run (eg. CBB). It should be uploaded to your root directory.__________________________
EDIT NOTE: replaced CBB 4.0 link with correct CBB 3.08 link. Replaced links to Correct direct China link. The readmes and the actual files are in English.
(Thanks Bandit-X)