If you are using illumina which would cover all the exons of MHC-I and MHC-II, there are many opensource software which gives 8 digit accuracy. E.g ATHLATES, SOAP-HLA,.
If you have Roche amplicon sequence data, which covers only exon2,3(MHC-I) and exon 1(MHC-II), there are no open source softwares available which could give 8-digit accuracy.
All the platforms have their own recommendations for HLA-typing commercial software. Roche and illumina recommends connexio, pacbio recommends ISO-SEQ.
PS: We had roche data for pilot studies (around 100 known samples) and used Connexio which gave us almost accurate results. I also used HLACaller for the same data and got similar results. but only 4 digit accuracy.