Marib is a font package dedicated to the Old South Arabian (Sabean) and to the Old North Arabian script. For both scripts, it comes in left to right and in right to left character orientation (i.e. it supports boustrophedon writing).
In addition, Old South Arabian comes in solid and outline versions.
Font formats: OpenType .otf and TrueType .ttf; Mac OS X and Win.
Old South Arabian
Old North Arabian
(new in font v. 2 and in Unicode v. 7)