This is Sim International's package repository. To use it:

On Debian 13:

Install your authentication token to /etc/apt/auth.conf.d/master.conf

Download Sim's signature to verify packages by running this command:

$ sudo wget http://upd.sim-international.com/sim.sig -O /usr/share/keyrings/sim.sig

Create /etc/apt/sources.list.d/master.sources with this content:

Types: deb deb-src
URIs: http://upd.sim-international.com/master/
Suites: trixie
components: main
Signed-By: /usr/share/keyrings/sim.sig

On Debian 11:

Install your authentication token to /etc/apt/auth.conf.d/master.conf

Download Sim's signature to verify packages and install it by running these commands:

$ wget http://upd.sim-international.com/sim.sig
$ sudo mkdir -p /usr/local/share/keyrings/
$ sudo mv sim.sig /usr/local/share/keyrings/

Create /etc/apt/sources.list.d/master.list with this content:

deb [signed-by=/usr/local/share/keyrings/sim.sig] http://upd.sim-international.com/master bullseye main
deb-src [signed-by=/usr/local/share/keyrings/sim.sig] http://upd.sim-international.com/master bullseye main

On Debian 9 and 10:

Ask Sim International to issue a key file.
Save this keyfile to /etc/apt/auth.conf.d/${user}.conf
echo "deb http://upd.sim-international.com/${user} buster main" > /etc/apt/sources.list.d/${user}.list
echo "deb-src http://upd.sim-international.com/${user} buster main" >> /etc/apt/souces.list.d/${user}.list (if your contract includes source deliveries)
wget -O - http://upd.sim-international.com/sim.sig | sudo apt-key add -

Now you can:

search for packages with the a320-, b737-, a330-, or sim- prefixes with apt search a320-
Install binary packages with apt install a320-0.7
Download source packages with apt source a320-0.7 (If your contract includes source deliveries or if sources are provided for LGPL compliancy)
Source code for LGPL software that is modified by Sim International is available here. For example apt source sim-qt will download the original Qt sources, plus the specific build-flags used by Sim International which disable GPL components. This is made available under the LGPL obligations of the components that are used.