Yes. Here are some:
- jo_gif.cpp: tiny GIF writer (public domain)
- gif.h: animated GIF writer (public domain)
- tiny_jpeg.h: JPEG encoder (public domain)
- lodepng: PNG encoder/decoder (zlib license)
- nanoSVG: 1-file SVG parser; 1-file SVG rasterizer (zlib license)
- tinyobjloader: wavefront OBJ file loader (BSD license)