Customize CrossPoint without a plugin store

The real "plugin" layer for CrossPoint. 23+ prebuilt families (Literata, Merriweather, Atkinson Hyperlegible, IBM Plex…). Download over WiFi on-device, upload via the web UI, or copy to /.fonts/ on the SD card. Build your own from any TTF with the font builder.

Selectable built-in UI themes: Classic, Lyra, Lyra Extended, RoundedRaff. Custom user themes are not installable. You pick from the built-ins.

Drop 24-bit BMPs (480×800 for X4, 528×792 for X3) into /.sleep/ on the SD card, or a single sleep.bmp in the root, for custom wallpapers/screensavers.

A desktop Calibre device driver that sends EPUBs to the reader over WiFi/WebSocket with auto-discovery. Installed into Calibre, not the device.

Convert books to the device-native format for the fastest rendering and control over grayscale: bigbag/epub-to-xtc-converter (web + CLI) and CrazyCoder/cr2xt (desktop). For manga, comics, and PDFs, varo6/xtcjs adds dithering and spread-splitting.

The most genuine plugin system in the scene: SUMI firmware ships a Lua scripting framework for user-written extensions, alongside ~20 built-in apps and a dictionary. If you actually want "installable plugins", this is it.

Often mislabelled as a JavaScript-app platform. It is not one. PlusPoint is a from-scratch C++ OS proof-of-concept for the X4. The app launcher is not built yet, so it is not a working plugin system today. For real scriptable plugins, use SUMI (Lua).