Wayland is obviously much younger than either the X Server and Mesa and it's development pace is still rising as more parties become interested in this Linux technology and as the project prepares for its major 1.0 milestone release later in 2012.
The Wayland Git repository itself now consists of 82 files that amount to 14,203 lines of code spread across 1067 commits from 58 developers. These statistics are as of this morning and generated using GitStats on the mainline Wayland and Weston repositories.
a small personal project back in 2008, has 763 commits while the developer with the second most commits has less than 50. In second is Pekka Paalanen followed by Benjamin Franzke, Tim Wiederhake, and Ander Conselvan de Oliveira. Intel Open-Source Technology Center developers dominate the list of most frequent contributors with Intel employing a large team of developers -- inclusing Kristian himself -- to advance Wayland/Weston. While Canonical wants to use Wayland a system compositor in Ubuntu 12.10 later this year, no Canonical employee is on the list of most active Wayland contributors. Their upstream contributions to this point have been minimal.
Weston as the reference Wayland compositor amounts to 47,275 lines of code spread across 137 files in 2019 commits from 55 developers.