Klevu - Klevu offers instant site search solution for eCommerce stores.
Sleeknote - Set up lead capture forms on your website in minutes. No coding required. Sync your new email leads with your favorite email service provider. Try for free.
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
POPUPSMART - A no-code tool to increase e-commerce sales, build email lists and engage with your visitors in just 5-minutes.
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.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.