English
New communication platforms have emerged to support developers in finding and creating the knowledge they need for program comprehension, maintenance, and evolution. Instant messaging applications are supplanting developer mailing lists in collaborative development toolchains. These applications provide a new medium, supporting faster and richer communication (e.g., embedded previews, images, files, videos). Research so far focused on extracting information from these platforms, but there is a lack of tools to visually and interactively explore them. We present DISCORDANCE, a tool for the interactive visual exploration of the complete message history of a Discord server. We show how three categories of views elicit insights on aspects of the structure, members, and software related content of a Discord server. We demonstrate use cases of DISCORDANCE to support software maintenance and evolution activities on an active software developer community, the Pharo Discord server.