Log in to Steam with your browser, and click the links that interest you below, then click the Subscribe button on that page.
They'll be inside the Half Life Alyx game in the ADDONS. You can enable them there. See Tutorial for ADDON usage.

Alyx Workshop

LOTS OF GREAT ADDONS AND MODS

Cool Addons

Flashlight Toggle Button
Spawn/Utility Menu
Scalable Init Support
Glorious Gloves

Levitation Parts 1-5

 Click Subscribe to all on the linked page.

Return to Rapture - Awesome Bioshock Alyx Mods

Return to Rapture: Chapter One

 Return to Rapture Chapter One - Click Subscribe to all on the linked page.

Return To Rapture: Chapter Two

 Return To Rapture Chapter Two - Click Subscribe to all on the linked page.

Return To Rapture Chapter Two - Description and "How-to"

Note: Quest owners and those experiencing crashes reduce the desktop screen mirror size by adding the following to the Launch Options: -w 4 -h 3 -window -novid

Portal World

required part1
p1required
[p1] Test_Chamber_01 & Test_chamber_02 DuelPack
required 2
ApertureVR - Thinking Without Portals
[P2] Sp_a1_wakeup
[P2] Sp_a3_00
[P2] Sp_a1_intro5
[P2] Sp_a2_triple_laser
Resistance Train
Wheatleys experiment [#VM6]

Lush Experiment (Portal)

Lush Experiment

Combine Motel

Combine Motel [incomplete]

White Corporation

White Corporation
White Corporation 2

Escape the apartment / Combine Aftermath / Resistance Revenge 1+2

Escape the Apartment
Combine Aftermath
Resistance Revenge
Resistance Revenge 2