Inputkit is a B2B SaaS aimed to help companies to gather feedbacks and reviews from their clients.
Docpool was build first to help an accountant gather documents from its clients.
It as since evolved to allow its users to easily build upload pages to get content that goes straight to your Google Drive from your clients, your friends or your students.
Bookman let people to read their books via email. Users can upload epub files and receive emails of the book's chapters. First 3 books are free then there a $20 subscription for unlimited epubs upload.
Also, users can upload pdf files to read them online!