I released new version of Ultimate Workflow Toolkit. Here is the list of new operations available:

• System:
  • Recalculate one Rollup field for record
  • Recalculate all Rollup fields for record
  • Actualize Exchange Rates (based on my post – http://butenko.pro/2014/10/08/microsoft-crm-2013-currency-exchange-rates-actualization/)
  • Cancel all waiting workflow instances of this workflow (based on my post – http://a33ik.blogspot.com/2015/07/howto-avoid-simultaneous-execution-of-2.html?m=1)
• Bulk Operations:
  • Execute On-Demand worfklow for every record from Public View/Private View/Generic FetchXml Query