Source 2 Engine Features
The Next-Gen S2 Engine is a significant departure to the legacy Source engine, running DX11 and Vulkan natively on their respective platforms.
Tools
Source 2 comes with an integrated development enviornment (IDE), consisting of:
Asset Browser, Level Editor, Material Editor, Model Editor, Particle Editor, and Film Maker.
- Asset Browser 
The Asset Browser allows quick searching, previewing, grouping, and managing assets.
It also serves as the hub for development, launching the other tools either by their icon, or by double clicking an asset.
Assets inside the browser can also be dragged into other tools (such as Hammer).
- Hammer Editor 
The Source 2 Level Editor (Hammer) is a revolutionary leap above even contemporary level editors.
On top of the expected brush-based manipulation, you can edit individual faces, edges, and even verticies, making it a full model editor.
The new primitive in S2 is the Mesh, a vertex-based system, allowing concave, and complex geometry to be authored by the level designer.