Ask HN: Examples of profitable little free web tools?
I created sendtodropbox.com (email attachments to Dropbox) as a side project about 3 years ago. After the initial prototype, two-ish rewrites, and monetizing it with a freemium model, it's now got 1100 paying subscribers and brought in $20k in revenue this year. I did the whole thing myself (aside from the website template design, which a buddy of mine helped out with). This doesn't technically fall under the "informative value" category, but going solo on a project to make it profitable is definitely possible.