Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
Clio - Clio provides a full suite of web-based practice management tools targeted specifically at the administrative needs of sole practitioners and small firms.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
MyCase - Practice More, Manage Less.
Klevu - Klevu offers instant site search solution for eCommerce stores.
PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.