I have to say Product Hunt is quite amazing to get attention and build valuable mini-apps to help with acquiring leads for our main product cenario.
Built this app using Vue.JS in a few hours - https://www.cenario.co/free-ads-spend-calculator
Building relevant mini applications to help drive acquisition seems like it could be a very effective strategy for growth, especially in the early stages. The likes of Hubspot and others have done very well with this particularly in their early phases of growth. Helps with SEO too.
What cool "mini-applications" to help drive the growth of the main product are people doing? :)
Love to know what others are thinking for this in their respective industries/target markets!