I am the founder and sole developer at LinkLocker, a subscription-based, privacy-centric bookmarking service. There are no social features at all, and the entire site was built from the ground up with respect for your privacy in mind. Currently the service is Web-only (with a REST API), but we hope to release an iOS app soon.
PootiePets is a goofy iOS sticker pack I made. It consists of a bunch of drawings of farting animals.
RandoRando is a truly-random number generator based on the random.org API. I built it a few years ago while learning to build Web apps with Python and Flask, and every now and then I find it to be a handy little tool.