QGIS Plugins & Tools that replicate Select ArcPy Tools

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I developed a complex python application for road generation from GPS Devices that uses a few Arcpy Tools.

I want to try and replicate this Applications functionality using a freeware like PyQGIS instead of Arcpy, but in order to do this I need to find tools & plugins from QGIS that mimic the following tools:

• arcpy.da.SearchCursor
  
• arcpy.TableToTable_conversion
  
• arcpy.JoinField_management
  
  • arcpy.MakeQueryTable_management
    
  • arcpy.Delete_management
    
  • arcpy.AddField_management
    
  • arcpy.CalculateField_management
    
  • arcpy.MakeXYEventLayer_management
    
  • arcpy.CopyFeatures_management
    
  • arcpy.PointsToLine_management, QGIS Points to Path: http://spatialgalaxy.net/2011/12/30/qgis-plugin-of-the-week-points-to-paths/
    
  • arcpy.Intersect_analysis
    
  • arcpy.SpatialJoin_analysis
    
  • arcpy.MakeFeatureLayer_management
    
  • arcpy.SelectLayerByAttribute_management
    
  • arcpy.LayerToKML_conversion
    
  • arcpy.ApplySymbologyFromLayer_management
    
  I am also researching this and will post the matching tools in the question as I find them to help anyone who is having similar issues, once all Arcpy tools have a matching PyQGIS tool or plugin I will accept an answer with them all in it, If an answer has at least 1 matching tool I will upvote, but no answer will be accepted until each arcpy tool has a matching PyQGIS
  

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