With the free build-in tangible modeling tools you can directly create Software Diagrams like Use Case Diagrams, Component Diagrams, State Charts,

• Blueprint Software Modeler - Community Edition 1.4.0
  Blueprint Software Modeler FREE Community Edition. A free and powerful UML software modeling tool implemented according to OMG's latest UML2.1 standard. Blueprint SM is based on...

• Nevron .NET Vision Q4_2006
  Nevron

• tangible architect community edition 2.0
  Create Database Applications in record time! tangible architect generates a full business object implementation ¨C including data access code - from C# interface definitions or UML ! Generated business objects realize the data access with...

• EventStudio Sequence Diagram Designer 2.5
  Sequence diagrams are a very effective way of modeling an object oriented system

• EventStudio Sequence Diagram Designer 2.5
  Sequence diagrams are a very effective way of modeling an object oriented system. Unfortunately, most UML based modeling tools only offer primitive support for sequence diagrams. EventStudio provides advanced constructs for sequence diagram based object modeling. EventStudio supports generation of message sequence charts (MSCs) and call flow...

• SharpShooter Diagrams 1.0
  Data visualization solves a complicated problem of decision making in short terms

• FlowChart.NET 4.2
  FlowChart.NET adds to applications the ability to create and present various kinds of diagrams: - flowchart and process diagrams - workflow and data flow charts - database entity-relationship diagrams - organizational and classification...