SpaceCore is a framework mod used by some of my other mods.

Json Assets lets content packs add custom content to the game. It currently supports crafting recipes, crops (including giant crops), fruit trees, big craftables, hats, weapons, clothing, and boots.

Generic Mod Config Menu adds an in-game UI to edit other mods' config options. This only works for mods designed to support it.

A framework for replacing NPC portraits with higher or lower resolution ones, and/or animated ones.

AeroCore is a coremod used by some of my other mods. Mostly, it's just code, but there are a few features available to users

Content Patcher Animations lets you animate textures in Content Patcher with its EditImage action.

Toolkit for Smapi Mods

This mod allows the creation of new NPCs that aren't friends with the player. They can have a schedule, a portrait, dialog... almost everything a normal villager NPC has. However, they won't show up on the Social menu and the player can't give them gifts.

Audio API & Audio Management for SMAPI, without the need for Harmony. Add custom audio tracks.

A Framework mod that allows modders to add custom shops to the game, as well as edit vanilla shops.

A utility mod built on top of the game's preconditions system to offer a conditions system any mod can use.

Allows other mods to exclude NPCs from certain quests and events, especially those that randomly select NPCs.

This is a small utility for Stardew Valley, which is simply necessary for installing most modifications to the game. SMAPI - The Stardew Modding API is a fancy interface that allows you to use modding DLLs. The program allows you to install the necessary DLL files for modifications.

Content Patcher loads content packs that change the game's data, images, and maps without replacing XNB files. Content packs can make changes dynamically based on many in-game details like location, weather, date, festivals or events, spouse, relationships, whether you have a Joja membership, etc.