VisualSVN - VisualSVN - Subversion plugin for Visual Studio
draw.io - Online diagramming application
Subversion Edge - What is Subversion Edge? A certified software stack containing the latest versions
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.
uberSVN - Free, easy to implement UI for Subversion which includes:
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.