ServiceDesk plus is available in 3 editions. Pick the edition that suits you the best.
Standard Edition: Help Desk Only (Free Forever - Upto 5 Technicians)
Professional Edition: Includes Help Desk & Asset Management.
Enterprise Edition: Incident, Problem Management, Change management with CMDB.
Note: Upgrade to ServiceDesk Plus 8.2 is available too. Please contact sales@manageengine.com to get your quote.