DRBL is described as '(Diskless Remote Boot in Linux) is a free software, open source solution to managing the deployment of the GNU/Linux operating system across many clients. Imagine the time required to install GNU/Linux on 40, 30, or even 10 client machines individually!'. There are three alternatives to DRBL for Linux and Windows. The best alternative is LTSP, which is both free and Open Source. Other great apps like DRBL are BeTwin (Paid) and openThinClient (Free, Open Source).
The Linux Terminal Server Project adds thin-client support to Linux servers. LTSP is a flexible, cost effective solution that is empowering schools, businesses, and organizations all over the world to easily install and deploy desktop workstations.
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LTSP vs DRBL opinions
pros, cons and recent comments
ltsp is useful for thin clients, but drbl goes (really well) for diskless
BeTwin is a software that enables two to five users to share the computing power of a single computer. It creates a virtual PC station for each user to simultaneously and independently operate in each station. Installation is simple.