On this page recent builds of Lilypond ‘s development brach are available for several platforms. These builds were made on 29 March 2019. The Documentation is available as well.
Note : These are just my own builds. See for the official stable and unstable releases Lilypond’s website.

Windows

lilypond_2.21.0-1.mingw.exe

ARM

I compiled Lilypond from source on my arm-based tablet. With the aid of a program called “CheckInstall” I managed to create an installable deb-file and succesfully installed it on one of my Raspberry Pies. So I guess it can be installed on other arm-based systems as well. The deb file is here (build 29 March 2019): lilypond_2.21.0_armhf.deb. Just copy it to a folder on your Raspberry Pi (or other arm-based machine) and install it with

dpkg -i lilypond_2.21.0_armhf.deb

To run Lilypond I needed to install three more dependencies on my Raspberry: guile 1.8, Libpangoft and ghostscript. The most recent version of Raspbian is based on Debian Stretch and Guile 1.8 is not part of Stretch. To be able to install it, you have to modify the sources.list of apt-get. Type:

sudo nano /etc/apt/sources.list

add the line

deb http://raspbian.raspberrypi.org/raspbian jessie main

and save the file. Then run

sudo apt-get update
sudo apt-get install guile-1.8-dev

The other two dependicies are installed by typing:

sudo apt-get install libpangoft2-1.0
sudo apt-get install ghostscript

After that, you should be able to run Lilypond on your Raspberry.

Linux 64

lilypond-2.21.0-1.linux-64.sh

Linux x86

lilypond-2.21.0-1.linux-x86.sh

MacOS X x86

lilypond-2.21.0-1.darwin-x86.tar.bz2