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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 1.21.1Library Api
Latest version
SL-Library-1.5.1-1.21.1+[NeoForge].jar
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
not stated
Downloads
466.3k
Updated
5 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.

All 27 releases
SL-Library-1.5.1-1.21.1+[NeoForge].jarrelease26 Jul 2026

SL-Library-1.5.1-1.21.1+[NeoForge].jar · 0.4 MB · for 1.21.1

Download latest
9dba84881ba5…
Older versions24
  • 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
  • SL-Library-1.4.2-1.21.1+[NeoForge].jar7 Jul 20261.21.10.4 MB4bf6ac540b59…Get
  • SL-Library-1.4.1-1.21.1+[NeoForge].jar4 Jul 20261.21.10.4 MB177 downloads70a09e4b373f…Get
  • SL-Library-1.4.1-1.20.1+[Forge].jar4 Jul 20261.20.10.4 MBdda97651c76a…Get
  • SL-Library-1.4-1.20.1+[Forge].jar4 Jul 20261.20.10.4 MB490c1cd69d85…Get
  • SL-Library-1.4-1.21.1+[NeoForge].jar4 Jul 20261.21.10.4 MBd2604e550d40…Get
  • SL-Library-1.3.5-1.21.1+[NeoForge].jar27 Jun 20261.21.10.3 MB1.2k downloads41b1bfcd7e1a…Get
  • SL-Library-1.3.5-1.20.1+[Forge].jar27 Jun 20261.20.10.3 MB7b7d28023a3f…Get
  • SL-Library-1.3.4-1.20.1+[Forge].jar24 Jun 20261.20.10.3 MB1.1k downloadsb526dbc19aad…Get
  • SL-Library-1.3.4-1.21.1+[NeoForge].jar24 Jun 20261.21.10.3 MB170b4df970c1…Get
  • SL-Library-1.3.3-1.21.1+[NeoForge].jar22 Jun 20261.21.10.3 MB223 downloadsdf8a057313be…Get
  • SL-Library-1.3.2-1.20.1+[Forge].jar16 Jun 20261.20.10.3 MB982 downloads4efecd93d5f3…Get
  • SL-Library-1.3.2-1.21.1+[NeoForge].jar16 Jun 20261.21.10.3 MB0f1818bba73a…Get
  • SL-Library-1.3.1-1.21.1+[NeoForge].jar10 Jun 20261.21.10.3 MB187 downloadsfadc7791518c…Get
  • SL-Library-1.3.1-1.20.1+[Forge].jar10 Jun 20261.20.10.3 MBde4641dc6f03…Get
  • SL-Library-1.3-1.20.1+[Forge].jar28 May 20261.20.10.3 MB832 downloads502a449e5b6c…Get
  • SL-Library-1.3-1.21.1+[NeoForge].jar23 May 20261.21.10.3 MB929 downloadsf327f3a57fee…Get
  • SL-Library-1.2-1.21.1+[NeoForge].jar22 Apr 20261.21.10.3 MB48 downloads73be003e9e02…Get
  • SL-Library-1.1-1.21.1+[NeoForge].jar13 Apr 20261.21.10.3 MB1.5k downloads8328d49214b7…Get
  • SL-Library-1.1-1.20.1+[Forge].jar13 Apr 20261.20.10.3 MB56c8cc2d7446…Get
  • SL-Library-1.0.1-1.20.1+[Forge].jar6 Apr 20261.20.10.3 MB6.0k downloadsa9616dac8046…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?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

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. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

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

BookshelfAn open source library for other mods!GeckoLibA 3D animation library for entities, blocks, items, armor, and more!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.

Last checked 5 d ago against CurseForge. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .