Not sure about clinical validation; however, you can use web-based vcf iobio tool https://vcf.iobio.io/. This would provide you an interactive visualization where you can check various stats such as Variant Density, Ts/Tv Ratio, Allele Frequency Spectrum, Base Changes, Variant Types, Insertion & Deletion Lengths, and Variant Quality. You can visualize this information on a different levels (chromosome wise, a specific region in a chromosome). This tools alongside other tools from iobio is fully open-source and can be installed on the local server. You can also check the quality of bam using http://bam.iobio.io/home.
I hope it would be useful to you. win