You could have downloaded NGSEP 3.3.1 for Mac from our software library for free. This free Mac application is an intellectual property of NGSEP Team. The software lies within Education Tools, more precisely Science.
From the developer:
NGSEP is an integrated framework for the analysis of DNA high throughput sequencing data. The main use of this app is the construction and downstream analysis of large datasets of genomic variation. NGSEP performs accurate detection and genotyping of Single Nucleotide Variants (SNVs), small and large indels, short tandem repeats (STRs), inversions, and Copy Number Variants (CNVs).
You may want to check out more software for Mac, such as Genealogy Pro, Analytics to Earth or TreeView X, which might be similar to NGSEP.