draw.io - Online diagramming application
CampBrain - CampBrain is an online registration software that has a superior registration structure that enables unlimited camps,sessions and option.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
CampManager - CampManager campsite online booking and management software that offers the one solution for everything
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Cogran - Cogran is a customizable management system for camps, classes, and more.