Workcraft is open-source project distributed under permissive MIT license (for third-party tools please refer to their respected licenses):
MIT License Copyright (c) 2017 Workcraft contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
This is the current version (last build from 2 February 2017) that supports Graphs, FSMs, Petri nets, DTDs, FSTs, STGs, CPOGs, Digital Circuits, Dataflow Structures, SONs, Policy nets and xMAS Circuits.
This is an experimental version, written entirely in Scala based on the functional reactive programming paradigm. This version (last build from 29 April 2013) only supports Petri nets and FSMs, so if you need to work with other models please download the latest release of Workcraft 3 series instead.
This is the previous version of Workcraft (last build from 20 July 2014). It supports Directed graphs, Petri nets, STGs, CPOGs, Digital Circuits, Dataflow Structures, SONs, Policy nets and xMAS Circuits.
This is the older version of the tool (last build from 1 April 2008), as described in the Petri Nets 2009 article. This version relies on a number of native libraries (DLLs/SOs), which are available for major platforms, but not all of them. The libraries for Windows and Linux OS's are bundled with the distribution.