Since OData endpoint was released with CRM 2011 I used CRM OData Query Designer developed by MVP fellow Rhett Clinton. Today I was working on brand new online instance of CRM 2015 and… I was not able to import lovely tool into CRM with message that solutions developed for CRM 2011 could not be imported into CRM 2015. I started to look for alternatives and found brilliant solution developed by other MVP fellow – Jason Lattimer. The great advantage of CRM REST Builder is that you can get complete code of calls using different frameworks developed for Dynamics CRM. So try, use and love this tool – CRM REST Builder.