Dilay is an open source, easy to use 3D sculpting application. With an update, roughly, one every 2 weeks, it is well maintained.
Dilay a 3D sculpting application.
Dilay is a 3D sculpting application that provides an intuitive workflow using a number of powerful modeling tools. As each tool locally subdivides the mesh where more details are required, Dilay allows artists to rapidly create complex meshes.