Since official .org site is shutting down, these are some of the popular vBulletin forum CMS addons. Version 4.x should work.

[AJAX]Advanced Forum Statistic - 4.0.2.zip [AJAX] - Advanced Forum Statistics.zip [AJAX] Live Search Eng v4.0.6.zip [AJAX] TopX 4.0.4.zip AMP Auto Tagger_2.0.1.zip Block Censored Words by BOP5 - VB4 v13.zip [DBTech] Advanced Post Thanks Like v3.6.3 [Lite].zip [DBTech] Advanced Registration v2.0.7pl2 [Lite].zip [DBTech] Advanced User Tagging v3.3.0 [Lite].zip [DBTech] DragonByte Gallery v1.3.4 [Lite].zip [DBTech] DragonByte SEO 2.0.43 [Lite].zip [DBTech] InfoPanels v2.2.4 [Lite].zip [DBTech] User Status & Moods v1.3.6-pl2.zip [DBTech] vBActivity & Awards v3.2.3 [Lite].zip [DBTech] vBCredits v2.1.0 (Lite).zip [DBTech] vBDonate v1.4.9 [Lite].zip [DBTech] vBDownloads v2.4.9 [Lite].zip [DBTech] vBNavTabs v1.3.3 [Lite].zip [DBTech] vB Optimise Lite v2.0.1.zip [DBTech] vB Optimise v2.7.1 [Lite].zip [DBTech] vBShop v3.5.3 [Lite].zip Duplicate IP Check by BOP5 Free v212.zip English Verify Mail before registration vb4_v2.0.8.xml Enhanced Captcha Image Veriffication VB3.x.x.zip fix_login.php force_users_to_read_a_thread_2_10.zip funcaptcha-vbulletin-v1.2.1.zip FuzzySEO vb4 1.5.0b.zip GCBOS_0.8_VB4.zip GlowHost_-Spam-O-Matic_v1.2.8_VB3_VB4.zip GlowHost-Spam-O-Matic_v2.1.2_VB4.zip Helpful Answers vb - 2.4.2.zip Hide_links_from_guests.zip Import External Images 1.0.5.iei4.zip iTrader 2.8.2 RC2 PATCHED.zip JB hCaptcha for vBulletin 4.zip keycaptcha-for-vbulletin-37-4x.zip kh99_new_recaptcha_v1_0.zip Limit Number of Posts&Threads in Forums Within a Time Frame - max_posts_threads.xml MARCO1 Advanced Reply - Edit With Smiles!.zip MARCO1 Hide BBCODE.zip MarkFL - Enhanced Thread Rating v1.3.zip No Spam Image Enhancement by BOP5 VB4 v1.0.zip PHPKD_VBAQR_Ultimate_4.0.110.zip PHPKD - vB Spam Assassin - PHPKD_VBSAS_4.2.202.zip pm_management_suite_lite.zip post_thanks_7_88_for_vB_423_with_collapse_scroll_postbit_fix_and_added_features.zip product-ajax_topstats_vb4a.xml product-avataronreg.xml product-changethreadsowner190_40-english.xml product-kh99_spambot_stopper_1.1.1.zip Product MARCO1 Admin Tools.zip Product - MARCO1 CKEditor Advanced Quick reply and Quick edit.zip product-mass_pm_4-0-1.zip product-mnl_random_avatar.xml product-onetouch_ban_clean_1.xml product-pluseone.xml Product Review Forums v1.4.0.zip product-threadprefix_changeinline.xml product-vbsc.xml product-websites_referred.xml Recent_Thanks_v2.6.2_vB4.zip Rename register.php by BOP5_v115.zip Sidebar Anywhere by BOP5 v220.zip solved_threads_2.0.1.zip Stop Forum Spam - SFS Integration v1.0.0.zip Stop the Registration Bots 4.0.2.zip uCash_4.0.1[20091120-2150].zip vaSpy-2.0.4.zip [vB 4] ipInfo 2.zip vBET2410.zip vBFoster Spamming Manager [LITE VERSION].zip vblinkdirectory105vb415.zip vblinkdirectory105.zip vBookie 4.2.1 for vBulletin 4.2.zip vbsc.zip vbseo_sitemap-3-0 PL1.zip vBSEO.v3.6.0.for.vBulletin.v3.x.and.v4.x.PHP.NULL-DGT.zip vB.Sponsors2.0.6.zip vbsso.zip vbStopForumSpam_v0.61.zip vmoods 4.1.0004.zip VSa - Advanced Forum Rules v5.0.8.zip VSa - Advanced Forum Statistics v7.1.zip VSa - Advanced New Posts v3.0.3.zip VSa - Advanced Permissions Based on Post Count v5.2.1.zip VSa - Advanced Registration v2.0.3.zip VSa - ChatBox v3.1.8.zip VSa - Check If Already Posted v2.0.1.zip VSa - Moderating Stats v2.0.2.zip VSa - Visitors In Last X Hours v3.0.5.zip Word Links FREE for VB4 by BOP5v20.zip