HotDocs - Template-driven, automated document & form assembly software
Windward Studios - Windward's solution includes a .NET or Java Engine, a set of code libraries for integrating reporting and document generation.
docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.
Apache Velocity - Velocity is a Java-based template engine.
Woodpecker - Legal document automation for solo & small firms. Simple to use, works in Word, connects to everything.
PandaDoc - Boost your revenue with PandaDoc. A document automation tool that delivers higher close rates and shorter sales cycles. We've helped over 30,000+ companies.