Clio - Clio provides a full suite of web-based practice management tools targeted specifically at the administrative needs of sole practitioners and small firms.

Freeplane - Freeplane is a powerful and free software for building mind maps.

MyCase - Practice More, Manage Less.

vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.

PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.

Pencil Project - Single-user mockup / wireframing / diagramming tool