Are there any POS coin open source mobile wallets implementations? Specifically, I'm interested in the thick clients with Simplified Payment Verification. Haven't found these so far, do they even exist? Why are the POS mobile wallets such poorly distributed comparatively to the POW coins?

Thanks in advance.
AFAIU, PoS is considered flawed by large parts of the cryptocurrency community.

I've not kept abreast of POS coins, but some that I could think of are Peercoin, NXT and Blackcoin, which are currently ranked 38, 39, and 58 on Coinmarketcap.

Unless I'm missing some new more popular ones, I'd say there is less software for them because they have less of an ecosystem / they are less popular?