Budgest is a Web application designed to manage budgets, for small to wide structures. Based on a double tree-structure (entity/nature), it allows the creation of annual or rolling slices budgets. It can import accounting data and allows the creation of dynamic reports to follow real-time evolution between account data and budget. A transverse view allows grouping of entities with no hierarchical relations (for example marketing departments of international companies). It supports users, groups, data versioning, and CSV import and export.