Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Klevu - Klevu offers instant site search solution for eCommerce stores.
AppDynamics - Get real-time insight from your apps using Application Performance Management—how they’re being used, how they’re performing, where they need help.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Zabbix - Track, record, alert and visualize performance and availability of IT resources