
ManageEngine ServiceDesk Plus
8.0#2 in it vendor management softwareFrom $10 a monthAndroidiOSWebAPI
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You want what its maker publishes above — check its page for the details.
SherpaDesk may suit support teams that need a shared way to handle requests, manage service levels, and provide a customer portal. The free plan is for one agent; paid plans list support for multiple technicians and additional features.