What are some alternatives?
When comparing FlowMapp and Great Apps Timeline, you can also consider the following products
Really Good UX - A library of screenshots for UX inspiration
The Beginnings - Beginnings of billion dollar companies
VisualSitemaps - Autogenerate visual sitemaps in seconds.
Startup Timelines - How the frontpages of famous startups changed over time
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Product Timelines - Feature timelines from some of our favorite products