Here are some thoughts, even though I'm not sure you asked for it ;) LongCal: I think there is something there with regards to "long-term thinking". But don't

Here are some thoughts, even though I'm not sure you asked for it ;) LongCal: I think there is something there with regards to "long-term thinking". But don't market it as a "calendar app". I believe there is potential in tracking people's long-term goals, breaking them down into tasks, and translating these tasks into chunks of work to build daily schedules and habits. The above is what I currently do in a text editor, and there is no "calendar app" that can do it for me. Don't make another calendar app, the space is overcrowded with Machine Learning powered calendar apps. How to validate? This one is tricky. I'd try customer interviews strategy (dalacv posted a book) to see if people are really unhappy with their current time management apps, and why. No need to build something before you figure out the pain points. Ideally you have a mockup of what you have in mind in order to validate your hypotheses against what people are telling you in interviews. Monetization is an issue you don't usually worry about with these kind of products. If you build a great product then people will come, and with enough people money will come. uTrim: I'm not sure about this one. I never use URL shorteners unless they are already integrated in a service I'm already using (e.g. Twitter). The bigger opportunity here may be to sell this directly to universities and automatically shorten anything that is posted on university-internal mailing lists and forums and provide analytics on top of that. How to validate? Try to sell it to universities (in particular, certain departments for certain products and then let it ripple through other departments) Vulgat Library: I'm assuming employees lend stuff to other employees (landing page isn't clear on this)? How to validate? Figure out what segment your customers are in and try to sell it to them. You'd probably need a more exhaustive landing page. This can be consumerized enterprise play where you are selling to individual employees within a company. They can set up the system themselves without needing permission from any higher-ups. They then invite other employees. Basically the Dropbox model. This way you can use consumer marketing strategies instead of needing B2B sales. Business naming app: I may be wrong but personally I'd forget about this one: 1. Generating good names automatically is extremely difficult 2. I doubt people want to have generated names 3. Don't see obvious monetization 4. One-time use