is there any support for transforming a Rascal AST into Famix meta model (from Moose technology)?
Rascal uses M3 meta-models that can, in principle, be easily converted to Famix (but you would have to write that mapping yourself).
There is M3 support for several languages (and the support is growing) so it also depends on the language you are interested in whether there is support for fact extraction from your source.