Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
hashtags.org - Hashtag is an extensive hashtag research platform for analytics and tracking of hashtags, providing...
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
HashtagWiki.com - Hashtag Generator Tool
Better Uptime - We call you when your website goes down
RiteBoost - Auto-hashtags, Auto-emojis, GIFs and much, much more, all according to your Enahce rules.