diff --git a/dev-test/config.yml b/dev-test/config.yml
index 2ffe5041..adc72647 100644
--- a/dev-test/config.yml
+++ b/dev-test/config.yml
@@ -62,6 +62,7 @@ collections: # A list of collections the CMS should be able to edit
 
   - name: 'settings'
     label: 'Settings'
+    icon: 'settings'
     delete: false # Prevent users from deleting documents in this collection
     editor:
       preview: false
diff --git a/dev-test/index.html b/dev-test/index.html
index cde4d1d4..11d07243 100644
--- a/dev-test/index.html
+++ b/dev-test/index.html
@@ -237,6 +237,7 @@
         );
       }
     });
+    CMS.registerAdditionalLink('Example.com', 'https://example.com/', 'new-tab');
   </script>
 </body>
 </html>
diff --git a/packages/netlify-cms-app/src/extensions.js b/packages/netlify-cms-app/src/extensions.js
index 9a71b254..c09f1a9b 100644
--- a/packages/netlify-cms-app/src/extensions.js
+++ b/packages/netlify-cms-app/src/extensions.js
@@ -1,3 +1,4 @@
+import React from 'react';
 // Core
 import { NetlifyCmsCore as CMS } from 'netlify-cms-core';
 // Backends
@@ -29,6 +30,7 @@ import NetlifyCmsWidgetColorString from 'netlify-cms-widget-colorstring';
 import image from 'netlify-cms-editor-component-image';
 // Locales
 import * as locales from 'netlify-cms-locales';
+import { images, Icon } from 'netlify-cms-ui-default';
 
 // Register all the things
 CMS.registerBackend('git-gateway', GitGatewayBackend);
@@ -66,3 +68,7 @@ CMS.registerEditorComponent({
 Object.keys(locales).forEach(locale => {
   CMS.registerLocale(locale, locales[locale]);
 });
+
+Object.keys(images).forEach(iconName => {
+  CMS.registerIcon(iconName, <Icon type={iconName} />);
+});
diff --git a/packages/netlify-cms-core/index.d.ts b/packages/netlify-cms-core/index.d.ts
index 42c689f2..fdb7b5a0 100644
--- a/packages/netlify-cms-core/index.d.ts
+++ b/packages/netlify-cms-core/index.d.ts
@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 declare module 'netlify-cms-core' {
-  import type { ComponentType } from 'react';
+  import type { ComponentType, ReactNode } from 'react';
   import type { List, Map } from 'immutable';
   import type { Pluggable } from 'unified';
 
@@ -578,7 +578,10 @@ declare module 'netlify-cms-core' {
       widgetName: string,
       serializer: CmsWidgetValueSerializer,
     ) => void;
-    resolveWidget: (name: string) => CmsWidget | undefined;
+    registerIcon: (iconName: string, icon: ReactNode) => void;
+    getIcon: (iconName: string) => ReactNode;
+    registerAdditionalLink: (title: string, link: string, iconName?: string) => void;
+    getAdditionalLinks: () => { title: string, link: string, iconName?: string }[];
   }
 
   export const NetlifyCmsCore: CMS;
diff --git a/packages/netlify-cms-core/src/components/Collection/Sidebar.js b/packages/netlify-cms-core/src/components/Collection/Sidebar.js
index fdae657f..fa046b0a 100644
--- a/packages/netlify-cms-core/src/components/Collection/Sidebar.js
+++ b/packages/netlify-cms-core/src/components/Collection/Sidebar.js
@@ -10,6 +10,7 @@ import { Icon, components, colors } from 'netlify-cms-ui-default';
 import { searchCollections } from '../../actions/collections';
 import CollectionSearch from './CollectionSearch';
 import NestedCollection from './NestedCollection';
+import { getAdditionalLinks, getIcon } from '../../lib/registry';
 
 const styles = {
   sidebarNavLinkActive: css`
@@ -67,6 +68,26 @@ const SidebarNavLink = styled(NavLink)`
   `};
 `;
 
+const AdditionalLink = styled.a`
+  display: flex;
+  font-size: 14px;
+  font-weight: 500;
+  align-items: center;
+  padding: 8px 12px;
+  border-left: 2px solid #fff;
+  z-index: -1;
+
+  ${Icon} {
+    margin-right: 8px;
+    flex-shrink: 0;
+  }
+
+  &:hover,
+  &:active {
+    ${styles.sidebarNavLinkActive};
+  }
+`;
+
 export class Sidebar extends React.Component {
   static propTypes = {
     collections: ImmutablePropTypes.map.isRequired,
@@ -79,6 +100,14 @@ export class Sidebar extends React.Component {
 
   renderLink = (collection, filterTerm) => {
     const collectionName = collection.get('name');
+    const iconName = collection.get('icon');
+    let icon = <Icon type="write" />;
+    if (iconName) {
+      const storedIcon = getIcon(iconName);
+      if (storedIcon) {
+        icon = storedIcon;
+      }
+    }
     if (collection.has('nested')) {
       return (
         <li key={collectionName}>
@@ -97,7 +126,60 @@ export class Sidebar extends React.Component {
           activeClassName="sidebar-active"
           data-testid={collectionName}
         >
-          <Icon type="write" />
+          {icon}
+          {collection.get('label')}
+        </SidebarNavLink>
+      </li>
+    );
+  };
+
+  renderAdditionalLink = ({ title, url, iconName }) => {
+    let icon = <Icon type="write" />;
+    if (iconName) {
+      const storedIcon = getIcon(iconName);
+      if (storedIcon) {
+        icon = storedIcon;
+      }
+    }
+    return (
+      <li key={title}>
+        <AdditionalLink href={url} target="_blank" rel="noopener">
+          {icon}
+          {title}
+        </AdditionalLink>
+      </li>
+    );
+  };
+
+  renderLink = (collection, filterTerm) => {
+    const collectionName = collection.get('name');
+    const iconName = collection.get('icon');
+    let icon = <Icon type="write" />;
+    if (iconName) {
+      const storedIcon = getIcon(iconName);
+      if (storedIcon) {
+        icon = storedIcon;
+      }
+    }
+    if (collection.has('nested')) {
+      return (
+        <li key={collectionName}>
+          <NestedCollection
+            collection={collection}
+            filterTerm={filterTerm}
+            data-testid={collectionName}
+          />
+        </li>
+      );
+    }
+    return (
+      <li key={collectionName}>
+        <SidebarNavLink
+          to={`/collections/${collectionName}`}
+          activeClassName="sidebar-active"
+          data-testid={collectionName}
+        >
+          {icon}
           {collection.get('label')}
         </SidebarNavLink>
       </li>
@@ -106,6 +188,7 @@ export class Sidebar extends React.Component {
 
   render() {
     const { collections, collection, isSearchEnabled, searchTerm, t, filterTerm } = this.props;
+    const additionalLinks = getAdditionalLinks();
     return (
       <SidebarContainer>
         <SidebarHeading>{t('collection.sidebar.collections')}</SidebarHeading>
@@ -122,6 +205,7 @@ export class Sidebar extends React.Component {
             .toList()
             .filter(collection => collection.get('hide') !== true)
             .map(collection => this.renderLink(collection, filterTerm))}
+          {additionalLinks.map(this.renderAdditionalLink)}
         </SidebarNavList>
       </SidebarContainer>
     );
diff --git a/packages/netlify-cms-core/src/lib/registry.js b/packages/netlify-cms-core/src/lib/registry.js
index 3f27ddf1..114b0e96 100644
--- a/packages/netlify-cms-core/src/lib/registry.js
+++ b/packages/netlify-cms-core/src/lib/registry.js
@@ -25,6 +25,8 @@ const registry = {
   templates: {},
   previewStyles: [],
   widgets: {},
+  icons: {},
+  additionalLinks: [],
   editorComponents: Map(),
   remarkPlugins: [],
   widgetValueSerializers: {},
@@ -58,6 +60,10 @@ export default {
   removeEventListener,
   getEventListeners,
   invokeEvent,
+  registerIcon,
+  getIcon,
+  registerAdditionalLink,
+  getAdditionalLinks
 };
 
 /**
@@ -284,3 +290,23 @@ export function registerLocale(locale, phrases) {
 export function getLocale(locale) {
   return registry.locales[locale];
 }
+
+/**
+ * Icons
+ */
+export function registerIcon(name, icon) {
+  registry.icons[name] = icon;
+}
+export function getIcon(name) {
+  return registry.icons[name];
+}
+
+/**
+ * Icons
+ */
+export function registerAdditionalLink(title, url, iconName) {
+  registry.additionalLinks.push({ title, url, iconName });
+}
+export function getAdditionalLinks() {
+  return registry.additionalLinks;
+}
diff --git a/packages/netlify-cms-ui-default/src/index.js b/packages/netlify-cms-ui-default/src/index.js
index b9bb4339..20d8900c 100644
--- a/packages/netlify-cms-ui-default/src/index.js
+++ b/packages/netlify-cms-ui-default/src/index.js
@@ -14,6 +14,7 @@ import AuthenticationPage from './AuthenticationPage';
 import WidgetPreviewContainer from './WidgetPreviewContainer';
 import ObjectWidgetTopBar from './ObjectWidgetTopBar';
 import GoBackButton from './GoBackButton';
+import images from './Icon/images/_index';
 import {
   fonts,
   colorsRaw,
@@ -63,6 +64,7 @@ export const NetlifyCmsUiDefault = {
   zIndex,
   reactSelectStyles,
   GlobalStyles,
+  images,
 };
 export {
   Dropdown,
@@ -97,4 +99,5 @@ export {
   reactSelectStyles,
   GlobalStyles,
   GoBackButton,
+  images,
 };