Ask HN: What software ideas do you have ?

Here are a couple of mine : - software to help learn guitar, detect notes played - universal text utility, any text area in any app and it allows you to do regular expression replace - web based data modelling and group ware tool - Website, written stories with music and images.. tell a story, add images and music. (other people can create collages, remix your stories) - image viewer with category tagging of images (for artists, designers)