Creating fishnet grid Shapefile in QGIS?

Look at the Processing Toolbox and you may choose many algorithms without the need of a plugin

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You don't need a plugin, just use a geoalgorithm from the toolbox:

Vector > Research Tools > Create Grid...

In QGIS 2.10 this is called 'Create Graticule'


Vector grid creation has been incorporated in QGIS for a long time:

Vector -> Research Tools -> Vector Grid

Note that the default grid spacing of 0.0001000000 units of the layer CRS is too small in most cases.

You might want to use Vector -> Geometry Tools -> Densify Geometries afterwards if you need to reproject the grid to another CRS where the lines should appear bended.