If you're feeling tech-savvy, you can actually build a custom client from scratch. You'll need to set up a workspace using tools like IntelliJ IDEA
Once you download a modded EaglercraftClient.html or .jar (which you’ll convert to HTML): how to add mods on eaglercraft
: Click "Upload" to select a mod file saved on your device. If you're feeling tech-savvy, you can actually build