If you have a Raspberry Pi or NUC with a connected scanner, you can easily share it to your network.

1. Install saned:

   sudo apt install sane

2. Edit /etc/default/saned and set RUN to yes.
3. After the installation go to the dicectory /etc/sane.d and edit the saned.conf. Add the following line to allow scanning from your network:

   aaa.bbb.ccc.ddd/mm

4. If you also use IPv6 add this line as well:

   [aaaa:bbbb:cccc:dddd::]/mm

5. So, for example (these are not real IP addresses of course):

   192.168.123.0/24

   [2001:db8::]/64

6. Afterwards, restart saned

   /etc/init.d/saned restart

And you should be good to go.

On the client side installation and configuration is even easier. Just install sane and maybe simple-scan (great application!), afterwards edit the /etc/sane.d/net.conf and add (e.g. as a last line) the name or IP address of your server.

That's is, now you're good to go!