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SL LibraryMinecraft mod for 1.21.1

Adds various base utilities, synchronization help, policy, packet sending and data driven

newest supported release 1.21.1Library Api
Latest version
SL-Library-PRE-2.0-1.21.1+[NeoForge].jar
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
not stated
Downloads
737.6k
Updated
7 d ago
Available on
CurseForge

Minecraft versions

Every version SL Library declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.20.1NeoForge, Forge17+declared12 Jun 2023

Download

From SL Library’s own host. Nothing is re-hosted here.

Browse 47 indexed releases

Most recently published release

SL-Library-PRE-2.0-1.21.1+[NeoForge].jarrelease31 Oct 2026

SL-Library-PRE-2.0-1.21.1-NeoForge.jar · 0.5 MB · for 1.21.1 · NeoForge

Download this release
62d3790d8aa7…
Older versions24
  • SL-Library-PRE-2.0-1.20.1+[Forge].jar31 Oct 20261.20.10.5 MB65dbfa4a658f…Get
  • SL-Library-1.7.1-1.20.1+[Forge].jar23 Oct 20261.20.10.5 MB36fa67de08c8…Get
  • SL-Library-1.7.1-1.21.1+[NeoForge].jar23 Oct 20261.21.10.4 MBd460203985b6…Get
  • SL-Library-1.7-1.21.1+[NeoForge].jar10 Oct 20261.21.10.4 MB4adfae2dc05b…Get
  • SL-Library-1.7-1.20.1+[Forge].jar10 Oct 20261.20.10.5 MB53df9ecb1bd9…Get
  • SL-Library-1.6.4-1.20.1+[Forge].jar1 Oct 20261.20.10.4 MB8f11c6b9b2c4…Get
  • SL-Library-1.6.4-1.21.1+[NeoForge].jar1 Oct 20261.21.10.4 MB878e579f4576…Get
  • SL-Library-1.6.3-1.21.1+[NeoForge].jar23 Sept 20261.21.10.4 MBa9e830c6105b…Get
  • SL-Library-1.6.3-1.20.1+[Forge].jar23 Sept 20261.20.10.4 MBa745a6802882…Get
  • SL-Library-1.6.2-1.20.1+[Forge].jar11 Sept 20261.20.10.4 MBcbc6a0a1f6e9…Get
  • SL-Library-1.6.2-1.21.1+[NeoForge].jar9 Sept 20261.21.10.4 MB329bf0bbd594…Get
  • SL-Library-1.6.1-1.20.1+[Forge].jar19 Aug 20261.20.10.4 MBcfbe5308e632…Get
  • SL-Library-1.6.1-1.21.1+[NeoForge].jar19 Aug 20261.21.10.4 MBe96b5c2cc0f1…Get
  • SL-Library-1.6-1.21.1+[NeoForge].jar17 Aug 20261.21.10.4 MB3ebaf5e67e47…Get
  • SL-Library-1.6-1.20.1+[Forge].jar17 Aug 20261.20.10.4 MBcf1b701307b3…Get
  • SL-Library-1.5.3-1.21.1+[NeoForge].jar9 Aug 20261.21.10.4 MB2d9a9fb93907…Get
  • SL-Library-1.5.3-1.20.1+[Forge].jar9 Aug 20261.20.10.4 MB4678f1de2c2d…Get
  • SL-Library-1.5.2-1.20.1+[Forge].jar8 Aug 20261.20.10.4 MBf24ab42ce45d…Get
  • SL-Library-1.5.2-1.21.1+[NeoForge].jar8 Aug 20261.21.10.4 MB8c1ae5a6d035…Get
  • SL-Library-1.5.1-1.21.1+[NeoForge].jar26 Jul 20261.21.10.4 MB239 downloads9dba84881ba5…Get
  • SL-Library-1.5.1-1.20.1+[Forge].jar26 Jul 20261.20.10.4 MB57005a67ea31…Get
  • SL-Library-1.5-1.20.1+[Forge].jar26 Jul 20261.20.10.4 MB1.2k downloads929ee5d810cb…Get
  • SL-Library-1.5-1.21.1+[NeoForge].jar22 Jul 20261.21.10.4 MB176 downloads15f2ce55c370…Get
  • SL-Library-1.4.2-1.20.1+[Forge].jar7 Jul 20261.20.10.4 MB1.1k downloads627b6fa911f6…Get

Frequently asked

Does SL Library work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version SL Library declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does SL Library support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Which platform or loader does SL Library support?

NeoForge, Forge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for SL Library?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

How do I install SL Library?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download SL Library safely?

Start with the author's page on CurseForge, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Details from CurseForge, where the author last updated it on 31 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .