Rivulet is an interpreter for an esoteric programming language of the same name, where code is written using semigraphic characters that form flowing strands. The system parses these visual programs into executable glyphs, interprets them according to unique semantics involving lists, strands, and conditional rollbacks, and can output results as text, numbers, or SVG visualizations. The architecture separates parsing, interpretation, and visualization concerns into distinct modules. While primarily a language implementation, the SVG generator demonstrates reusable visualization techniques.