IdeasAI - OpenAI-powered startup idea generator
ConversionTracking.com - Track your conversions, see where your sales come from, and optimize your marketing campaigns.
Ideas Grab - A list of +3400 ideas that you can get for your projects.
Weberlo - Weberlo offers cookieless tracking and marketing attribution.
Startup Stash - A curated directory of 400 resources & tools for startups
Feather Attribution - A free and tiny javascript library to track UTM tags, ref and referrer data client side so you can store these in your own database.