RSS.app - Monitor the web the way YOU want to.
productboard - Beautiful and powerful product management.
FetchRSS - Generate RSS out of any website.
Aha - Aha! is the new way to create visual product roadmaps. Web-based product management tools and roadmapping software for agile product managers.
FiveFilters Feed Creator - Create feed from elements (e.g. links) extracted from a given web page
ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.