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I'm looking for an easy language/command line utility to draw sequence and timing diagrams (could be 2 different tools). I've already found Mscgen for sequence diagram drawing and looks pretty good, but I'm studying other possibilities.
Thanks
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Under each actor or system there are long dotted lines called lifelines, which are attached to them. Actions are performed with lines that extend between these lifelines. When an action line is connected to a lifeline it shows the interaction between the actor or system.
In UML diagrams, such as sequence or communication diagrams, lifelines represent the objects that participate in an interaction. For example, in a banking scenario, lifelines can represent objects such as a bank system or customer. Each instance in an interaction is represented by a lifeline.
opt is used to describe optional step in workflow. For example, for online shop purchase sequence diagram you may use opt to describe how user can add gift wrapping if she wishes. alt may be used to describe two variants of payment: using credit card or wire money transfer.
PlantUML. http://plantuml.sourceforge.net/sequence.html
PlantUML is used to draw UML diagram, using a simple and human readable text description.
The generated images can then be used without any reference to the GPL/LGPL/ASL/EPL/MIT license. It is not even necessary to stipulate that they have been generated with PlantUML, although this will be appreciate by PlantUML team.
In my experience it has been easy to use and it produces nice looking diagrams. I can't recommend it more highly.
Output file types:
-tsvg To generate images using SVG format -teps To generate images using EPS format -txmi To generate XMI file for class diagram -thtml To generate HTML files for class diagram -ttxt To generate images with ASCII art -tutxt To generate images with ASCII art using Unicode characters
Here is an example showing how to create a simple sequence diagram. 
@startuml Alice -> Bob: Authentication Request Bob --> Alice: Authentication Response Alice -> Bob: Another authentication Request Alice <-- Bob: another authentication Response @enduml You can also create more detailed diagrams by using lifeline activation and destruction: 
@startuml participant User User -> A: DoWork activate A A -> B: << createRequest >> activate B B -> C: DoWork activate C C --> B: WorkDone destroy C B --> A: RequestCreated deactivate B A -> User: Done deactivate A @enduml If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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