Chisio BioPAX Editor, or simply ChiBE, is a free editing and visualization tool for pathway models represented by the BioPAX format, using SBGN Process Description Language, based on Chisio.
See the wiki for more information.
Babur, Ö., Dogrusoz, U., Çakir, M., Aksoy, B. A., Schultz, N., Sander, C., & Demir, E. (2014). Integrating biological pathways and genomic profiles with ChiBE 2. BMC genomics, 15(1), 642.
Babur, O., Dogrusoz, U., Demir, E., & Sander, C. (2010). ChiBE: interactive visualization and manipulation of BioPAX pathway models. Bioinformatics, 26(3), 429-431.