Jean Michel  wrote:
 Are there also GaNita or Siddhaanta manuscripts available ? I
mean, through the Muktabodha IRI.
 
 I don't think so, but I could be wrong. There are three collections in the Muktabodha digital library with easily searchable indexes. 
1) The vedic manuscripts from Gokarna
2) The Shaiva-siddhanta paper transcripts from the IFP/EFEO in Pondicherry
3) A searchable etext library of tantric manuscripts

All three accessable from https://etexts.muktabodha.org/digital_library.htm

Harry Spier