Warning
godot-ascii-csharp has been archived in favor of godot-ascii, a GDExtension port of this addon.
godot-ascii-csharp is an ASCII renderer backed by a Godot Tilemap node. Each glyph can have full-color foreground and background colors.
Rendering is done with a single shader and in chunks of 16x16 glyphs, so draw calls can be batched allowing for very fast draw time. Setting glyphs in the map is optimised using C# spans, though rendering is so fast that modifying the map will likely be the bottleneck in a project. The biggest performance issue currently is sending the ASCII cell data from C# to Godot, which could be optimized in the future with this: godotengine/godot-proposals#7842