The latest version of OWLGrEd is 1.6.5. It is free for any use.
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After downloading OWLGrEd, extract (unzip) the archive. You will have to run OWLGrEd with administrator privileges because it needs to register an OCX component. To do that, navigate into the unzipped folder, right click on owlgred.exe and select "Run as Administrator" from the context menu. You should see a message that the OCX registration has succeeded.
You can visualize an existing ontology by selecting "Visualize Ontology" from the splash window when opening OWLGrEd for the first time. Additional ontologies can be visualized from the project diagram's context menu item "Load Ontology".
To create a new ontology, select "OWL" tool from the Project Diagram's palette, then click on the diagram canvas where you want to place the ontology node. Afterwards a new window will open where you can edit the ontology name and other meta data. After closing the window you can open the created ontology with a double click on the ontology node.
To save an ontology to an .owl file, right click on the ontology canvas and select "Save Ontology" from the context menu.
You can share your ontology with others on the web by exporting it to the SVG format and by placing it in your HTML file. Right click on the ontology canvas and select "Save Ontology" from the context menu. Alternatively you can export to a picture file by selecting "Diagram → Save As Picture → Diagram..." from the menu bar.
Ontology layout mode can be changed through "Diagram → Automatic Alignment" in OWLGrEd toolbar.
The way elements are displayed can be changed in the style dialog. To open the style dialog, right-click on an element you want to modify and select Change Type Style. Some of the things you can change in the style dialog are: node shape and background color, line color and routing, compartment (text field) visibility and font.
OWLGrEd can interoperate with Protégé (up to the 5.0.0 beta 17). To enable this feature, you need to download the Protégé plugin lv.lumii.tda.jar (Version 2.0) and place it into the Protégé plugin folder (e.g., "C:\Program Files\Protege\plugins\").
To visualize an existing ontology from Protégé, first enable Protégé import in OWLGrEd. This is done by clicking the toolbar icon "Enable Import from Protege" in the project diagram. Then on the Protégé side you can select "Tools → Export to TDA" from the task bar. You can change which kinds of axioms to visualize through "File → Preferences" in the "TDA Preferences" tab in Protégé.
To send an ontology from OWLGrEd to Protégé, right-click on the ontology canvas and select "Send To Protege" from the context menu (Protégé must be already open).