Ubiquiti

Ubiquiti Unifi is scalable and has a linux controller software, meaning you only need to buy APs and a PC with linux on it (ubuntu recommended) to run the network.

The UAP-Pro can handle 200 concurrent clients and the UAP-LR / LR / UAP-Outdoor can handle 100 simultaneous clients.

The UAP's are very cheap.

There are still some problems apparently though.

Installing the controller on Debian

This needs to run under a desktop environment, so make sure you have one.

[1]

You may need to change the ports

[2]

files

/var/lib/unifi/data/system.properties

if this doesn't exist

java -jar /usr/lib/unifi/lib/ace.jar discover

/usr/lib/unifi/logs/server.log

/usr/lib/unifi/logs/mongod.log

migrating controller from one machine to another

[3]