| Title | CMS Category |
|---|---|
| OneWindow | Groupware |
| OnePageCRM | CRM Solutions |
| Omeka | E-Learning Gallery Software |
| Odoo | Enterprise Solutions |
| October | Traditional CMS |
| Nuclino | Groupware Wiki Software |
| Notion | Groupware Wiki Software |
| nopCommerce | Ecommerce |
| NodeBB | Forum Software |
| Nikola | Static Site Generators |
| NetSuite | CRM Solutions Ecommerce Enterprise Solutions |
| NerdyCMS | Specialized CMS |
| NativeScript | App Frameworks |
| Nanoc | Static Site Generators |
| MyBB | Forum Software |
| My Little Forum | Forum Software |
| Mura | Headless CMS |
| Mukurtu | Specialized CMS |
| mooSocial | Social Network Solutions |
| Moodle | E-Learning |