Plone is fully open source, and is free software under the GPLv2. On GitHub.com, you can find the many repositories that make up the Plone project, ranging from the core software itself to the documentation sources. Available hotfixes. There may be hotfixes applicable to your version of Plone.
plone + GoConvert
Use GoConvert and plone to maximize the ROI of your sales and marketing spending. Enrich information in your plone account, improve contact and deal information, and start visualizing marketing and sales performance. GoConvert works around the clock to automatically fill in missing data. Your insights get better all the time.