Disarm is a Spriter skeletal animation runtime for GameMaker Studio 2.3. Disarm is written in pure GML in order to support the greatest possible range of platforms.

Disarm supports most of the stable features of Spriter Pro, such as:

• Multiple entities per armature
• Pivot points
• Character maps
• Sprite and point attachments
• Bone keyframes for translation, scale, rotation, parent, and transparency
• Attachment keyframes for translation, scale, rotation, parent, transparency, pivot point, frame index, and z-index
• Animating between keyframes instantly, or by using linear interpolation, quadratic interpolation, or cubic animation
• Animating the z-order and hierarchy of bones and sprites

Other features supported by Disarm include:

• Combine and layer multiple character maps
• Modify entity data at runtime
• Render animations whose sprites span multiple texture pages
• Blend between multiple animations
• Bake groups of animations into a sequence of vertex buffers that can be reused later

Does not support the HTML5 export! If you want to fix the bugs and make it work, be my guest.

See the wiki page.