diff --git a/README.md b/README.md
index 081fc836..db549eb7 100644
--- a/README.md
+++ b/README.md
@@ -409,6 +409,7 @@ Table of Contents
   * [gitential.com](https://gitential.com) — Software Development Analytics platform. Free: unlimited public repositories, unlimited users, free trial for private repos. On-prem version available for enterprise.
   * [healthchecks.io](https://healthchecks.io) — Monitor your cron jobs and background tasks. Free for up to 20 checks.
   * [instrumentalapp.com](https://instrumentalapp.com) - Beautiful and easy-to-use application and server monitoring with up to 500 metrics and 3 hours of data visibility for free
+  * [letsmonitor.org](https://letsmonitor.org) - SSL monitoring, free for up to 5 monitors
   * [loader.io](https://loader.io/) — Free load testing tools with limitations
   * [nodequery.com](https://nodequery.com/) — Free basic server monitors up to 10 servers
   * [opsgenie.com](https://www.opsgenie.com/) — Powerful alerting and on-call management for operating always-on services. Free up to 5 users.
@@ -423,7 +424,7 @@ Table of Contents
   * [statuscake.com](https://www.statuscake.com/) — Website monitoring, unlimited tests free with limitations
   * [thousandeyes.com](https://www.thousandeyes.com/) — Network and user experience monitoring. 3 locations and 20 data feeds of major web services free
   * [uptimerobot.com](https://uptimerobot.com/) — Website monitoring, 50 monitors free
-  
+
 ## Crash and Exception Handling
 
   * [bugsnag.com](https://www.bugsnag.com/) — Free for up to 2,000 errors/month after the initial trial
@@ -637,7 +638,7 @@ Table of Contents
    * [skyvia.com](https://skyvia.com/) — Cloud Data Platform, offers free tier and all plans are completely free while in beta
    * [remotemysql.com](https://remotemysql.com) — Remote MySQL Database hosting, setup is instant and use phpMyAdmin for administration, free for 100Mb data, free backups, no query limits and 99% uptime.
    * [InfluxDB](https://www.influxdata.com/) — Timeseries database, free up to 3MB/5 minutes writes, 30MB/5 minutes reads and 10,000 cardinalities series
-   * [Quickmetrics](https://www.quickmetrics.io/) — Timeseries database with dashboard included, free up to 10,000 events/day and total of 5 metrics. 
+   * [Quickmetrics](https://www.quickmetrics.io/) — Timeseries database with dashboard included, free up to 10,000 events/day and total of 5 metrics.
 
 ## STUN, WebRTC, Web Socket Servers and Other Routers
 
@@ -735,7 +736,7 @@ Table of Contents
   * [landen.co](https://www.landen.co) — Generate, edit and publish beautiful websites and landing pages for your startup. All without code. Free tier allows you to have one website, fully customizable and published on the web.
   * [lensdump.com](https://lensdump.com/) - Free cloud image hosting.
   * [marvelapp.com](https://marvelapp.com/) — Design, prototyping and collaboration, free plan limited to one user and one project.
-  * [Mindmup.com](https://www.mindmup.com/) — Unlimited mind maps for free, and store them in the cloud. Your mind maps are available everywhere, instantly, from any device. 
+  * [Mindmup.com](https://www.mindmup.com/) — Unlimited mind maps for free, and store them in the cloud. Your mind maps are available everywhere, instantly, from any device.
   * [Pencil](https://github.com/evolus/pencil) - Open source design tool using Electron.
   * [pexels.com](https://www.pexels.com/) - Free stock photos for commercial use. Has free API that allows you to search photos by keywords.
   * [photopea.com](https://www.photopea.com) — A Free, Advanced online design editor with Adobe Photoshop UI supporting PSD, XCF & Sketch formats (Adobe Photoshop, Gimp and Sketch App).