I'm one of the co-founders of FormKiQ, an Open Source DMS that runs on AWS.

After almost three years of development, we've finally reached the point (v1.11.1) where we think our project can go head-to-head with other document management systems when it comes to all of the expected functionality, including OCR, Encryption, Intelligent Document Processing, and Fulltext Search.

FormKiQ deploys into your AWS account, but you can also try out our demo account via our website at https://formkiq.com

Thanks!