pysam - Pysam is a Python module for reading and manipulating SAM/BAM/VCF/BCF files. It's a lightweight wrapper of the htslib C-API, the same one that powers samtools, bcftools, and tabix.
genome-maps - An open-source high-performance web-based HTML5 genome browser. Genome Maps can be customized and allow browsing user data such as BAM and VCF files among other formats.