A software toolset for the modeling and animation of e-commerce transactions. The toolset is open-source and is made up of three components; a CASE plug-in for MagicDraw™ UML (v12), a workflow engine and a centralized web client for interacting with the model via a web browser. This toolset is for business analysts who need to model the content and structure of complex messages for multiple e-business partners. After defining the messages business partners can interact -or play- with the transactions in an easy to understand way. Reduce your testing and IT development costs by validating the business requirements prior to beginning any development.

UMLGraph allows the declarative specification and drawing of UML class and sequence diagrams.

Hackolade is a visual data modeling tool for NoSQL and multimodel databases like MongoDB, DynamoDB, and Couchbase. Schema modeling in a schemaless world seems like a contradiction. Hackolade applies some Entity Relationship theory to non-relational databases to represent denormalized data in a user-friendly way.

PUG (PHP UML Generator) is a tool which generates an UML class diagram from a live PHP object graph.

Yakindu is an open-source-toolkit for the model-driven development of embedded systems. Through the systematic use of models, it aims at an integrated development process as well as an increase in quality and maintainability.

CASE Spec is Goda Software's powerful, innovative, easy-to-use requirements tracking and lifecycle management tool. This very simple tool enables effective requirements tracking, analysis,baselining, collaboration, interfacing with other tools and creating system blueprints. CASE Spec features an innovative traceability matrix that illustrates the relationships among requirements, systems and software components. With this information at their fingertips, project managers, software architects and developers can clearly see how changing requirements affect software and systems development processes.

MetaEdit+ allows developers to obtain modelling and code generation tool support for domain-specific languages (DSM) within days. DSM languages are more expressive than generic UML and allow developers to generate full code, making development less complex and accelerating development time with a factor of 5 to 10. MetaEdit+ provides an open standards-based WebServices API for integration purposes and runs on all major platforms in single and multi-user set-up.

Stylebase for Eclipse is an open source tooling environment for software architects and designers. Stylebase is a reuse repository for architectural models and design patterns and it assists in applying quality-driven architecture design into software engineering.

Violet is a UML editor with these benefits:
* Very easy to learn and use
* Draws nice-looking diagrams
* Completely free
* Cross-platform.
Violet is intended for developers, students, teachers, and authors who need to produce simple UML diagrams quickly

MySQL Workbench enables a DBA, developer, or data architect to visually design, generate, and manage all types of databases including Web, OLTP, and data warehouse databases. It includes everything a data modeler needs for creating complex ER models, and also delivers key features for performing difficult change management and documentation tasks that normally require much time and effort.