The first 5 pages of Da Archive have the most of the older ‘un -maintained’ troves.The best thing is to go through them all soon and get what pdfs interest you.

I think specific smaller curated troves are easier to maintain than huge Collections.Check out Da Curated Archive to see what's in it. Pick a game or small publisher you like that’s not too big and complete it as best you can easily.Upload the pdfs somewhere. Hunt for and request the missing things. If it gets taken down, put it up again later. Using indirect links seems to work for Mageguru.

These are some Possible Candidates, based on modest size and perceived popularity.Most are in Da Archive, in various places and degrees of completeness:

13th Age3pp Iron Gods6d6

7th Sea 2e

Abandon All HopeAberrant/TrinityAces & EightsAchtung CthulhuACKAction Movie WorldAdvanced Fighting Fantasy 2nd:Adventures in Middle EarthAeonAFMBEAgainst the Dark YogiAlbedoAlterkineAlternityAkashicAmazing AdenturesAmethystAMPAnimaAnomalous Subsurface EnvironmentApocalypse WorldArduinArrowflightArs MagicaAshen StarsASSHAstral EmpiresAntlantean TrilogyAtomic HighwayBabylon 5Barbarians of Lemuria

Barsoom/ Martian adventuresBase RaidersBASH/BLAMBasic Role PlayingBattle Century G/ZBattlefield Gothic Beyond the WallBig Eyes Small MouthBlades in the DarkBlue PlanetBlue RoseBoot HillBrave New WorldBroken UrtheBreachworldBubblegum Crisis/ Dominion Tank PoliceBuck RogersBureau 13CapesCAHS2Cartoon Action HourCar WarsCastle FalkensteinCastles & CrusadesCerulean SeasChampionsChillClockwork DominionCold Hard WorldColonial GothicConanContinuumCortex PlusCosmic PatrolCrawling Under a Broken MoonCrimson SkiesCrimson WorldCryptworldCthulhuTechCyberpunk 2020CYOA BooksCypher Systemd20 Modernd20 FutureDaredevilsDark ConspiracyThe Dark EyeDark FantasyDark Future

Dark Horizons UniverseDark Heresy Dark MatterDarwin's WorldDeadlandsDead ReignDelta GreenDeus VultDoctor WhoDouble CrossDC HeroesDegenesisA Dirty WorldDragon AgeDragonball ZDragon KingsDragonmechDragon Star Dragon WarriorsDream ParkDresden FilesDungeon WorldDying EarthDystopian WarsEarthdawnEldritch HighEnd of the WorldEoris EssenceEspionage EtherscopeEverlastingExaltedElric / Melnibone /StormbringerEmpire of the Petal ThroneEncyclopaedia ArcaneEngine HeartEsoterroristsFading SunsFairy MeatFalloutFantasy CraftFateFiascoFireflyFear ItselfFreeportFellowshipFeng Shui 3edFireborn

Flashing BladesFreeway WarriorFringeworthyFolkloricForces of WarmaHordesFudgeFull Metal ZeroGame of ThronesGammaWorldGangbustersGary Gygax Collection GatecrasherGear KriegGeminiGhostbustersGiant Guardian GenerationGeistGodboundGodlikeGods of the FallGolden HeroesGrey LotusGrim TalesGumshoeGypsy KnightsHacklopediaHackmasterHarp (ICE)Harry PotterHelfrostHavenHeartQuestHeavy GearHero SystemHero QuestHong Kong Action TheaterIn NomineIron KingdomsIronclaw/JadeclawJAGS - WonderlandJames BondJovian ChroniclesJudge DreddJudge's GuildKaigakuKagematsuKalamarKen Writes About StuffKingdom Death

Kobolds Ate My BabyKobold GuidesKultThe KyngdomsLabyrinth LordLamentations of the Flame PrincessThe LaundryLeagues of Adventure Leagues of Gothic HorrorLegacy – Life Among the StarsLegend - RQLegends of the WulinLone WolfLow LifeMaelstromMageMars AttacksMarvel Heroic RPGMechanical DreamsMechwarriorMektonMERP Middle EarthMidnightMindjammerMistbornMithrasMonster of the WeekMonsterheartsMonster Hunter InternationalMordheimMorrow ProjectMunchkinsMutants & MastermindsMutant ChroniclesMutant City BluesMutant EpochMutant Year ZeroMythic VistasNephilimNight's Black AgentsNight WitchesNoirNumeneraOccultoctaNeOne DiceThe One RingOnly WarOsprey

Other DustOVA the Anime rpgPalladium FantasyParanoiaPendragonPocket UniversePolarisPony StuffPorphyraPrivateers and GentlemenProtoculture AddictsPtolusQinRadianceReignRenegade LegionRiddle of SteelRingworldRisusRobotechRocket AgeRocket Ship Empires 1936Rogue MageRolemaster/SpacemasterRunequestSavage WorldsScionShadow of the Demon LordShadow, Sword, and Spell Shadows of EsterenThe ShroudSidewinderSix GunSkybourneSkyrealms of JoruneSLA IndustriesSong of Ice and Fire SorcererSpirit of '77Spirit of the CenturySpace 1889The SprawlSpycraftStar AceStar FrontiersStars Without NumberStarSeigeStarship TroopersThe Strange

SupernaturalSwords & SorcerySwords & WizardryTalislantaTech NoirTekumelTMNTTerra FeraxTerran Trade AuthorityThieves WorldThrilling TalesThousand SunsTimemasterTokyo Brain PopTokyo HeroesTop SecretTorchbearerTorgTrancersTranshuman Space Treasure AwaitsTremulusTribe 8Tri-StatTruth & JusticeTunnels and TrollsTwilight 2000Uncharted WorldsUndergroundUnhallowed MetropolisUnknown Armies Urban ShadowsValorVanguardVictorianaVillains &VigilantesWar of the Burning SkyWeird War IIWesternsWheel of TimeThe Whispering VaultWild TalentsWitchcraftWonderland-JAGSWonderland No MoreWorld of Warcraft RPGWorld's Largest DungeonWurmYggdrasil

This is not a list of opinions, just games with at least 3 books and less than a jillion.

- - -

RPG Magazines out there includeArcaneDifferent WorldsAdventure Gaming ImagineKobold QuarterlyOwl and Weasel& MagazinePyramidShadisThe Space GamerWarlockWhite Dwarf (Early issues have Traveller, D&D, Runequest, etc.)White Wolf???https://archive.org/search.php?query=rpg%20magazine

Thanks.