Customization
LibreMaple aims to expose the entirety of Maplestory to customization. Not just cosmetic changes and NPC scripts, but fundamental changes to gameplay allowing for new entirely custom classes, custom game content, client-side plugins, and more.
Without the restriction that a black-box client puts on the game as a whole (both client and server side), Maplestory can be freed from the way that Nexon wants it, and from the way that Nexon wanted it so many years ago.
True freedom
Maplestory has always been nominally free-to-play. Then, with the advent of private servers for the game, even the burden of microtransactions could be lifted. But Maplestory has never been free as in freedom.
Now, with the power of the Journey client (licensed under the AGPL v3) and the open-standard data format it uses (NX PKG4, licensed under the CC BY-SA 3.0), the work of the earliest Maplestory private servers (c.f. OdinMS, licensed under the AGPL v3) can be completed. Maplestory can be played without any of Nexon's proprietary software or data formats, yet still be the old Maplestory you already know and love, however you want it.
Collaboration
LibreMaple is a large undertaking, but all players and fans — long-time or new — have something to gain from it. LibreMaple is not itself a Maplestory private server. The efforts of LibreMaple go towards no server in particular, but rather allow a set of tools that can be developed and used freely by anyone for any purpose (including independent private servers).
As such, LibreMaple welcomes and accepts contributions from persons of all stripes and all affiliations. Such a project can only thrive on cooperation.