A small JavaScript library to create and animate annotations on a web page

Rough Notation uses RoughJS to create a hand-drawn look and feel. Elements can be annotated in a number of different styles. Animation duration and delay can be configured, or just turned off.

Rough Notation @ GitHub

Annotto is the only go to annotation tool to successfully annotate your documents at scale

COMT is the core engine of co-ment(R), the leading Web service for text annotation. It is an autonomous software released under the ​GNU Affero GPL version 3 with a reservation clause on the trademark co-ment (see trademark use regulation). COMT enables you to install and run a text-annotation Web service. COMT operates a workspace shared among a group of users. In this workspace, one can create, upload, submit to comments, revise, and export texts and their comments. User rights are defined for the whole set of texts in the workspace and can be specialized for each text. You can install COMT to run your own service or use co-ment as a hosted service: