Artwork for the Stars in Shadow game project
These are weapon assets for the Human fleet, and some shot effect concepts.
In the game, you research technologies that unlock increasingly larger ship hulls
and increasingly more sophisticated weapons. Each hull contains varying number and sizes of empty hardpoints, in which the player can place their choice of weapons that they've researched. Some weapons have heavy or point defense ("PD") variants. For a simplified view of the weapon tech tree see here
Each race will have its own set of weapon visuals, though some of the individual items may be recolors of this generic set. Some races will also have unique weapons.
(edit 7/10/14: added third-tier weapons.)