One way would be to use the categories suggested by the notations in the lower right corners of most covers of the Catalyst-era products (note - this categorization is based entirely on what I can determine from Catalyst's own classification hierarchy - several products would fit into more than one category, depending on how you look at it. Also, this list does not include Catalyst reprints of earlier FanPro works.):
Core Rulebooks
- A Time of War
-- A Time of War Companions
--- A Time of War Companion
--- AToW Free RPG Day Booklet
--- AToW Quick-Start Rules
--- Masters and Minions - The StarCorps Dossiers
- Alpha Strike
-- Alpha Strike Companions
--- Alpha Strike Companion
--- Alpha Strike Mapboard Play
--- Alpha Strike Quick-Start Rules
-- Alpha Strike Sourcebooks
- BattleMech Manual
- Campaign Operations
- Interstellar Operations
- Strategic Operations
-- Strategic Operations Companions
--- BattleForce Quick-Start Rules
--- Counters
- Tactical Operations
-- Tactical Operations Companions
--- Record Sheets: Prototypes
--- Tactical Operations: Record Sheets and Compiled Tables
--- Tactical Operations: Power-Ups
- TechManual
- Total Warfare
-- Total Warfare Companions
--- Record Sheets
---- RS: 3050 (Upgrade)
---- RS: 3060
---- RS: 3075
---- RS: 3085
---- Blank Record Sheets
--- Starterbooks
---- Starterbook: Fist and Falcon
---- Starterbook: Wolf and Blake
- Warchest Point System Campaign Framework
- Quick-Strike Rules Game Aids
-- Introductory 'Mech Cards
-- TRO: 3039 Quick-Strike Unit Cards
-- TRO: 3050U Quick-Strike Unit Cards
-- TRO: 3055 Quick-Strike Unit Cards
HexPacks
- Cities and Roads
- Lakes and Rivers
- Mountains and Canyons
Box Sets
- Introductory Box Set
-- Introductory Box Set Companions
--- Starterbook: Sword and Dragon
--- Record Sheets: Sword and Dragon
- Beginner Box
- A Game of Armored Combat
Technical Readouts
- Technical Readouts
-- TRO: 3039
-- TRO: 3050 (Upgrade)
-- TRO: 3075
-- TRO: 3085
--- TRO: 3085 (Supplemental)
-- TRO: 3145
--- TRO: 3145 (Capellan Confederation)
--- TRO: 3145 (Draconis Combine)
--- TRO: 3145 (Federated Suns)
--- TRO: 3145 (Free Worlds League)
--- TRO: 3145 (Lyran Commonwealth)
--- TRO: 3145 (Mercenaries)
--- TRO: 3145 (Republic of the Sphere)
--- TRO: 3145 (The Clans)
-- TRO: 3150
-- TRO: Prototypes
-- TRO: Succession Wars
-- TRO: Vehicle Annex (Revised)
- Technical Readout Supplements
-- Constable Pacification Suit
-- Record Sheets: 3145 - New Tech, New Upgrades
-- Record Sheets: 3145 - Unabridged
- Experimental Technical Readouts
-- Primitives (I - V)
-- Republic (I - III)
-- 1945
-- Boondocks
-- Boondoggles
-- Clans
-- ComStar
-- Corporations
-- Davion
-- Gladiators
-- Gunslingers
-- Kurita
-- Liao
-- Marik
-- Mercs
-- Most Wanted
-- Periphery
-- Phantoms
-- Pirates
-- RetroTech
-- Royal Fantasy
-- Steiner
-- Succession Wars
Historical Sourcebooks
- Historical Supplements
-- Era Digest: Age of War
-- Era Digest: Dark Age
-- Era Digest: Golden Century
- Historical Sourcebooks Companions
-- Historical Turning Points Series (Antallos, Galtor, Glengarry, Mallory's World, Misery, New Dallas, Tortuga)
- Star League
-- Star League Era Sourcebooks
--- Era Report: 2750
--- Field Manual: SLDF
--- Historical - Liberation of Terra I
--- Historical - Liberation of Terra II
--- Historical - Reunification War
-- Star League Era Plot Supplements
--- Field Report 2765 Series (AFFS, CCAF, DCMS, FWLM, LCAF, Periphery)
- Succession Wars
-- Succession Wars Era Sourcebooks
--- First Succession War
--- Second Succession War
- Clan Invasion
-- Clan Invasion Era Sourcebooks
--- Era Report: 3052
--- Era Report: 3062
- Jihad
-- Jihad Campaigns
--- Total Chaos
-- Jihad Plot Sourcebooks
--- Blake Ascending
--- Jihad Hot Spots: 3072
--- Jihad Conspiracies
--- Jihad Hot Spots: 3076
--- Jihad Secrets: The Blake Documents
--- Jihad Hot Spots: Terra
--- Jihad: Final Reckoning
-- Jihad Plot Sourcebooks Companions
--- Jihad Turning Points Series (Atreus, Atreus Bonus Tracks, Dieron, Hesperus II, Luthien, New Avalon, Sian, Tharkad, Tharkad Bonus Tracks)
-- Jihad Plot Supplements
--- Dossiers
---- The Bounty Hunter
---- Lamenkov's Liability
---- Salazar Tsakalotos
---- Youling Zhanshi
--- Field Reports
---- Field Report Series (AFFS, CCAF, Clans, DCMS, FWLM, LAAF, Periphery)
--- Objectives
---- Objectives Series (Capellan Confederation, Draconis Combine, Federated Suns, Free Worlds League, Lyran Alliance, Periphery, The Clans)
- Republic Era
-- Republic Era Sourcebooks
--- Field Manual: 3085
--- Historical: Wars of the Republic Era
- Dark Age
-- Dark Age Era Sourcebooks
--- Era Report: 3145
--- Field Manual: 3145
--- Shattered Fortress
-- Dark Age Plot Sourcebooks Companions
--- Dark Age Turning Points Series (Liao, Vega)
Factions
- Faction Sourcebooks
-- Handbook: House Kurita
-- Handbook: House Liao
-- Handbook: Major Periphery States
- Clans Sourcebooks
-- Historical: Operation Klondike
-- Record Sheets: Operation Klondike
-- The Wars of Reaving
-- The Wars of Reaving Supplemental
- Deep Periphery Sourcebooks
-- Interstellar Expeditions
Record Sheets
- Long Tom
- Red Raider Buccaneer
- 3039
- 3039 (Unabridged)
- 3050 (Upgrade) Clan and Star League
- 3050 (Upgrade) Inner Sphere
- 3058 (Unabridged) Clan
- 3058 (Unabridged) Inner Sphere
- 3060 (Unabridged)
- 3067 (Unabridged)
- 3072
- 3075 (Unabridged) Age of War
- 3075 (Unabridged)
- 3085 (Unabridged) Old is the New New
- 3085 (Unabridged) Project Phoenix
- 3085 (Unabridged) The Cutting Edge
- Project Phoenix (Upgrade)
- Succession Wars
- Vehicle Annex - IndustrialMechs and Exoskeletons
Spotlight On
- (Crescent Hawks, Crimson Seeker Star, First Marik Protectors, Holt's Hilltoppers, Nakayama's Blood, Stone's Trackes, Unending Faith)
Specials
- Halloween
-- Empires Aflame
-- Necromo Nightmare
-- War of the Tripods!
- April Fools
-- Best Ever - An Eighth World Adventure
-- Welcome to the Nebula California