Question: I need a solution that allows me to send documents for electronic signatures without requiring recipients to download or sign up for anything.

If you need to send documents for electronic signature without requiring recipients to download or sign up, Acrobat Sign is a great option. This Adobe-based service lets people sign documents without downloading or signing up, and it offers tools for tracking documents and getting real-time visibility into their status. It also offers bulk sending, integration with other software and custom branding, all of which can be used at large enough scale to accommodate different business needs.

Another top contender is Docusign. Docusign has a full electronic signature product that can be integrated with many other software packages. It offers intelligent agreement management with AI-powered data extraction and real-time contract review cycles to keep document processes running fast and securely. The service also offers multi-channel delivery and electronic notarization, and can be used by businesses of different sizes and in different industries.

If you're a developer looking for a more programmatic approach, Document Automation Hub offers a collection of programming interfaces to automate document processes. It can handle tasks like electronic signatures, PDF editing and generation of documents from templates. It's geared for developers who want to build document automation into their own apps, an approach that can be more economical and flexible.

Last, Sendforsign offers a contract API and SDK that lets companies manage their own agreements and those with customers and other partners. With customizable workflows and immediate e-signing notifications, Sendforsign can speed up the signing process and reduce setup time and integration costs. It's good for companies that want to add electronic signatures to their own processes without a lot of setup.