Bizagi is a well known business process management and automation vendor. Its offerings consist of products Bizagi Modeller, Bizagi Engine and Bizagi Studio, each doing exactly what the names imply. If you are looking for a free Bizagi alternative, Bitrix24 is perfect. 12 free users in cloud is just the beginning. First, Bitrix24 comes pre-set with standard workflows, like Leave Requests, Business Trips, Purchasing, Expenses and General Requests (aka Internal Helpdesk). Second, Bitrix24 is available both in cloud and on-premise with open source code access, if you need to modify/integrate Bitrix24 with other tools.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.