Should SortMerge.jl be in the list?
It is not as polished as FlexiJoins.jl but its performance are very good (e.g. it can cross-match 2 catalogs each with 10^6 entries in ~2 sec, example here).
Also, @barrettp, is the JuliaAstro Zoom meeting open to anyone?
I would really like to participate… 