added Esri Geoportal Server, an open source catalog
added Esri Geoportal Server, an open source catalog

licensed under Apache 2.0.
pjdufour/project-open-data.github.io,fedspendingtransparency/fedspendingtransparency.github.io,cmurphyUSAID/implementation-guide,portofsandiego/project-open-data.github.io,Chuck8080/opendata,bpushed/project-open-data.github.io,judecalvillo/project-open-data.github.io,fedspendingtransparency/fedspendingtransparency.github.io,judecalvillo/project-open-data.github.io,Chuck8080/opendata,portofsandiego/project-open-data.github.io,bpushed/project-open-data.github.io,fedspendingtransparency/fedspendingtransparency.github.io,pjdufour/project-open-data.github.io,portofsandiego/project-open-data.github.io,pjdufour/project-open-data.github.io,fedspendingtransparency/fedspendingtransparency.github.io,portofsandiego/project-open-data.github.io,pjdufour/project-open-data.github.io