If you installed them using a Feature, deactivate and Uninstall the
Feature then remove  the .DLL from the GAC.

I am using console application to add events to a list.

other reply for how to gain access to the instance of the
EventHandler and then call the Delete Method. You can also iterate
through the EventReceivers collection using a ForEach until you find the
EventReceiverDefinition with the right name. It's easier if you don't
know the GUID.

Deactivate the Feature.................

To remove  the event  receiver in code use the following:

SPEventReceiverDefinition eventDef = list.EventReceivers[Guid];
eventDef.Delete();

You may want to check out the SharePoint Tips Utility Pack:
http://www.codeplex.com/spstipsUtilityPack.

and thanks for link to download, tool

I am using a console application to add events to a list.