Narrato are building an open platform for the quantified self. They currently only have one sample app called Narrato journal but it might be one to keep an eye on: https://www.narrato.co/

On the subject of quantified self Stephen Wolfram's blog post 'The Personal Analytics of My Life' (http://blog.stephenwolfram.com/2012/03/the-personal-analytic...) is an interesting read.