TreeViewer

TreeViewer is a cross‑platform application for drawing and manipulating phylogenetic trees. It follows a modular design in which small, interchangeable modules handle specific tasks such as node coordinate calculation or branch rendering, and each module includes its own user manual accessible from the interface. The software is written in C# .NET 7 and runs on Windows, macOS (Intel and Apple Silicon), and Linux, offering both a graphical user interface and a command‑line utility for rendering trees that are too large for real‑time preview.

The program is intended for researchers and analysts who need to visualise evolutionary relationships, providing a stable, fully documented environment for creating publication‑ready tree plots. Its modular architecture allows users to extend or customise functionality without altering the core application, and the command‑line tool enables batch processing on headless servers.

TreeViewer is distributed under the GNU Affero GPLv3 license and includes installers that add the executables to the system PATH and create desktop shortcuts. It is cited in the literature as a flexible tool for phylogenetic tree visualisation.