Olympus

Olympus provides a cross‑platform installer and manager for the Everest mod loader used with the 2D platformer Celeste. It automates the download and injection of Everest’s code into the game executable, handling updates and dependency resolution without altering the original game files. The tool runs on macOS, Windows and Linux, and supports installations from Steam, itch.io and Epic Games, though it does not work with the Windows Store version.

Through Olympus users can enable a range of modifications such as custom sound effects, graphics replacements, new maps, character dialogues and code‑based changes. It also offers quality‑of‑life features including an in‑game updater, Discord Rich Presence, save‑file renaming, live map reloading, and a debug console that can be accessed without editing save data.

The installer is open‑source and can self‑update, while providing a simple graphical interface for switching between vanilla and modded versions of Celeste. It is intended for players and creators who want to manage and test Everest mods efficiently across supported operating systems.