Free uml sequence diagrams software for windows

UMLSpeed is an easy to use compiler for a simple, C-style language also allowing declaration of UML entities and diagrams.
Diagrams can be compiled into SVG and the entities to XMI for use with other tools.
Why?
- Graphical UML tools in general suck - why should we, as programmers have to drag and drop stupid graphical things and use a mouse when we could express what we want 10 times faster with a text editor and a simple notation?
- A declarative approach is closer to the mental model used by developers when designing systems.
- Why should we lay out diagram components when the computer could do it for us?
- Graphical UML tools are bloated, huge, memory and disk-hogging monsters.
- Graphical UML tools use either a binary data format or XML, which is not particularly friendly to source code control systems.
Main features:
- Written in GCJ-portable java and compiled natively. Its extremely fast even when dealing with thousands of entities and diagrams.
- Has no dependencies on external libraries and is very lightweight.
- Purely command-line driven and takes miniscule resources.
- Flexible enough with file imports that large UML projects can be broken up into separate files and only individual bits built at a time as required.
- C-style syntax means that the source language integrates well with source code control and diff tools.
- Standards compliant - produces interoperable SVG and XMI, as well as clean source code.
- Can integrate with automated build tools for regular diagram/xmi compilation.
- Consistent language for all diagram types.
- Strikes a balance between automatic laying out of components and giving you control through the use of layout managers - no having to input co-ordinates.
- Compiler/parser
- Namespaces, Class diagrams and related entities
- Use case diagrams and related entities
- Sequence diagrams
- Auto-link pathfinding
- XMI 1.3 output
- VIM syntax highlighting
- Code generation (Java and Python)

UML StateWizard is a add-in for Visual C++, which provides a UML (Unified Modeling Language) state machine programming mechanism in form of portable standard C or C++ classes for either embedded systems development and simulation, or Windows/WinCE application development.
After embedded systems simulation and debugging in IDE, developer can move program to a destination working environment (such as VxWorks, embedded Linux, etc) with little or no extra investment of effort.
- A ClassWizard-like round-trip UML dynamic modeling/development tool runs in popular IDEs.
- A Cross-platform state-oriented framework for Win32, Linux, pSOS.
- For concurrent,distributed and real-time application development.
UML StateWizard supports:
- Visual C++ 6.0 English and German Edition
- eMbedded Visual C++4.0
- Visual Studio 2003
- Visual Studio 2005 (new)
UML StateWizard is a full-featured UML tool:
- UML diagram support: StateWizard supports the state tree, state chart drawing for dynamicl modeling.
- Forward engineering: The StateWizard UML tool does not limit its use to just pictorial depictions of diagrams. Because the structure of the system defined by the diagram is translated by a developer into actual source code, StateWizard bridges this step by generating the source code in a state machine framework with the methods stubbed out. Developers can take up this stub code and fill in with the actual code.
- Reverse engineering: Reverse engineering is exactly the opposite of forward engineering. In reverse engineering, StateWizard loads all the files of the application/system, identifies state relationships among applications, and reconstructs the entire state machine structure along with all relationships.
- Round-trip engineering: A rule in software design is that no design remains unchanged. This is as true for small systems as it is for large systems. During development, the design structure defined in the UML model undergoes changes to incorporate differences in implementation that may not have been envisaged during design. It becomes very difficult to keep the design of the system synchronized with the changes in the source code. StateWizard?s round-trip engineering feature allows the UML tool to synchronize the model with changes in the application code. StateWizard enforces real-time synchronization of its model to modifications in the source code. For example, developers can visually do a drag-and-drop operation in a state chart diagram and the source code will change as well. On the other hand, developers may directly modify the source code and modifications will be automatically shown in the state chart diagram. StateWizard serves as a bridge between state chart diagram and source code.
- Documentation: StateWizard provides some way for the designer to document design decisions in the diagrams. A designer may save a state chart as a BMP file and a state tree as a text file.
- Integration with popular IDE (VC++): With the increasing use of iterative methodologies for building software systems, it becomes very difficult to keep the design of the system in sync with the developed code. Hence, it would be useful if the UML tool provides integration with popular IDEs. This feature would enable the UML tool to be updated with the changes in the source code made in the IDE.

DiaCze - diagram drawing & modelling software.
You will be able to use DiaCze - diagram drawing software UML, ERD, ... in order to create UML, UML 2.0, EML diagrams, ER, ERD, state diagrams, network topology schema, Cisco networks, component models, process models, business models, ...
In many ways - this application contain more functions than Microsoft Visio and it is free.