Rezonator provides tools for functional linguistics, with a focus on annotating and visualizing patterns of language use in naturally occurring conversation. Rezonator supports multiple types of linguistic analysis including resonance, coreference, anaphora, syntactic dependency, topic marking, search, and concordance. Rezonator provides Unicode support for any language, including right-to-left text direction. Users can import 7 different data types, including plain text, interlinear glossed text (IGT), transcription, Elan, one-word-per-line (OWPL), and CoNLL-U.