Everything for Minecraft 1.5.1 in one place: 799 plugins, 330 resource packs, 139 maps, 125 mods and 9 shaders. This version came out on March 20, 2013.
Mouse TweaksEnhances inventory management by adding various functions to the mouse buttons.481.8M downloads
The Twilight ForestA realm basked in mystery and eerie twilight, you will overpower terrifying creatures and secure the adventure of a lifetime; in the Twilig…209.7M downloads
iChunUtilShared library used by iChun's mods128.7M downloads
BiblioCraftBookcases, armor stands, shelves and so much more!107M downloads
BuildcraftExtending Minecraft with pipes, auto-crafting, quarries, engines and much more!44.4M downloads
Portal GunThis mod adds the Portal Gun, as well as several other portal-related aspects, to Minecraft!44.2M downloads 
Beyond Belief ShadersA shaderpack that has evolved tremendously over the years!3.7M downloads
CH MotionSuper light weight motion blur pack212.5K downloads
SI: Spectre [DISCONTINUED]DISCONTINUED193.5K downloads
Chippa256 ShadersGive your Minecraft that retro 256-color look with low-res pixelation options!91.9K downloads
Sildurs Shaders TFC setupSildurs Shaders TFC setup 1.18.289.4K downloads
CRT Monochrome ShadersThis shaderpack turns your game into a retro 1980s-style CRT screen80.5K downloads 
FaithlessThe pack that plays like a mod. Delivering hundreds of QoL, nostalgic, and accessibility features in one.6.9M downloads
Default HD 128xMinecraft, but in sharp, clean HD! 128x5.9M downloads
Remove Potion ParticlesRemoves Particles from Potions and Beacons3.5M downloads
Soartex Fanver - ModdedModded support for the Soartex Fanver resourcepack.2.5M downloads
Optimum Realism POM & PBR 64x/128x/256x/512xA realistic-themed resourcepack for Minecraft Java Edition2.2M downloads
Invisible Item FramesMakes item frames invisible.1.9M downloads 
PixelPrinterCreates images and pixel-art using in-game blocks64.5M downloads
LobbyAPICreate user friendly menus to travel to worlds46.2M downloads
MusicAddeds the Ability to play music from a custom resourcepack on a server, without overriding existing music45.9M downloads
WorldEdit for BukkitWorldEdit is an in-game map editor for both creative and survival24.1M downloadsNoMobSuffocationMobs will be teleported up until they are no longer suffocating21.1M downloads
ClearLaggA new perfect way to clear common lagg in your server!19.3M downloads 
Waka Islands 1 Survival Island MapCan you survive the isles of Waka?251K downloads
[v4.1.1] Escape the LabKidnapped and imprisoned by a mad scientist, your goal is to escape the lab. Single- and multiplayer.223.4K downloads
Eronev Mansion Adventure. The classic pumpkin adventure by JigarbovEronev Mansion Adventure. The classic pumpkin adventure by Jigarbov187.1K downloads
Notchland Amusement Park, over 100K downloads and counting!13 coasters and over 65 mini games98.3K downloads
[v1.2.0] Escape the Prison[v1.2.0] Escape the Prison96.9K downloads
Kab's Resource Pack Showcase 1.7Show off your 1.7 textures!61.8K downloads Forge has the most mods of any loader for 1.5.1 (25), ahead of Fabric (17), NeoForge (13) and Quilt (4). Mouse Tweaks leads the mod ranking for 1.5.1, followed by The Twilight Forest, iChunUtil and BiblioCraft.
Next to the versions around it, Minecraft 1.5.1 has 416 more projects than 1.4.7 (986) and 122 fewer than 1.5.2 (1,524). Minecraft 1.5.1 is part of the 1.5 family, together with 1.5.2.
OptiFine has the most shaders of any shader loader for 1.5.1 (7), ahead of Iris (5). 16x has the most resource packs of any resolution for 1.5.1 (201), ahead of 32x (29), 64x (26), 512x+ (11), 128x (9) and 256x (5).
Forge leads with 25 mods for 1.5.1, followed by Fabric (17), NeoForge (13) and Quilt (4).
Yes. MineUniverse lists 9 shaders for Minecraft 1.5.1: 7 for OptiFine and 5 for Iris.
Minecraft Java Edition 1.5.1 was released on March 20, 2013. MineUniverse lists 1,402 projects for it.
MineUniverse lists 1,402 projects for Minecraft 1.5.1: 799 plugins, 330 resource packs, 139 maps, 125 mods and 9 shaders.
16x leads with 201 resource packs, followed by 32x (29), 64x (26), 512x+ (11), 128x (9) and 256x (5).
