diff --git a/README.md b/README.md
index 9d811741..69e5d426 100644
--- a/README.md
+++ b/README.md
@@ -148,6 +148,7 @@ Say thanks!
 <td>Duck Duck Go<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/duckduckgo.svg" width="125" title="Duck Duck Go" /><br>926 Bytes</td>
 <td>Bing<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/bing.svg" width="125" title="Bing" /><br>241 Bytes</td>
 <td>IMDb<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/imdb.svg" width="125" title="IMDb" /><br>526 Bytes</td>
+<td>Heroku<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/heroku.svg" width="125" title="Heroku" /><br>453 Bytes</td>
 </tr>
 </table>
 
@@ -245,6 +246,10 @@ Say thanks!
 <td>Sass<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/sass.svg" width="125" title="Sass" /><br>531 Bytes</td>
 <td>Linux<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/linux.svg" width="125" title="Linux" /><br>966 Bytes</td>
 <td>JSON<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/json.svg" width="125" title="JSON" /><br>557 Bytes</td>
+<td>Yarn<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/yarn.svg" width="125" title="Yarn" /><br>514 Bytes</td>
+<td>Backbone<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/backbone.svg" width="125" title="Backbone" /><br>463 Bytes</td>
+</tr>
+<tr>
 <td>Go<br><img src="https://edent.github.io/SuperTinyIcons/images/svg/go.svg" width="125" title="Go" /><br>582 Bytes</td>
 </tr>
 </table>
diff --git a/images/android-vector-drawable/backbone.xml b/images/android-vector-drawable/backbone.xml
new file mode 100644
index 00000000..cd3a3883
--- /dev/null
+++ b/images/android-vector-drawable/backbone.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="512dp"
+    android:height="512dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+
+    <path
+        android:fillColor="#fff"
+        android:pathData="M15,0 L497,0 Q512,0,512,15 L512,497 Q512,512,497,512 L15,512 Q0,512,0,497 L0,15 Q0,0,15,0 Z" />
+    <path
+        android:fillColor="#000000"
+        android:strokeColor="#848484"
+        android:strokeWidth="2"
+        android:pathData="M380,102 L380,269 L256,339 L256,291 L339,244 L339,170 L256,217 L256,173 L380,102" />
+    <path
+        android:fillColor="#002a41"
+        android:strokeColor="#848484"
+        android:strokeWidth="2"
+        android:pathData="M132,102 L132,269 L256,339 L256,291 L173,244 L173,170 L256,217 L256,173 L132,102 M380,410 L380,243 L256,173 L256,221 L339,268 L339,339 L256,291 L256,339 L380,410" />
+    <path
+        android:fillColor="#000000"
+        android:strokeColor="#848484"
+        android:strokeWidth="2"
+        android:pathData="M132,410 L132,243 L256,173 L256,221 L173,268 L173,339 L256,291 L256,339 L132,410" />
+</vector>
\ No newline at end of file
diff --git a/images/android-vector-drawable/heroku.xml b/images/android-vector-drawable/heroku.xml
new file mode 100644
index 00000000..5be6e06c
--- /dev/null
+++ b/images/android-vector-drawable/heroku.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="512dp"
+    android:height="512dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+
+    <path
+        android:fillColor="#000000"
+        android:pathData="M15,0 L497,0 Q512,0,512,15 L512,497 Q512,512,497,512 L15,512 Q0,512,0,497 L0,15 Q0,0,15,0 Z" />
+    <path
+        android:fillColor="#000000"
+        android:strokeColor="#fff"
+        android:strokeWidth="16"
+        android:pathData="M367,99 L145,99 C123,99,115,107,115,129 L115,383 C115,405,123,413,145,413 L367,413 C389,413,397,405,397,383 L397,129 C397,107,388,99,367,99" />
+    <path
+        android:fillColor="#fff"
+        android:pathData="M182,284 C238,256,276,253,289,259 C298,263,298,274,298,274 L298,373 L331,373 L331,273 S330,241,304,229 S242,228,216,235 L216,140 L182,140 M306,194 S328,172,331,140 L297,140 C292,169,272,194,272,194 M182,372 L219,339 L182,306" />
+</vector>
\ No newline at end of file
diff --git a/images/android-vector-drawable/yarn.xml b/images/android-vector-drawable/yarn.xml
new file mode 100644
index 00000000..ae7c7312
--- /dev/null
+++ b/images/android-vector-drawable/yarn.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="512dp"
+    android:height="512dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+
+    <path
+        android:fillColor="#000000"
+        android:pathData="M15,0 L497,0 Q512,0,512,15 L512,497 Q512,512,497,512 L15,512 Q0,512,0,497 L0,15 Q0,0,15,0 Z" />
+    <path
+        android:fillColor="#000000"
+        android:strokeColor="#fff"
+        android:strokeWidth="16"
+        android:pathData="M411,310 C388,306,341,344,329,344 C329,344,340,291,296,242 C339,181,328,122,320,105 C310,86,296,98,296,98 S272,23,240,100 C201,98,193,125,168,135 C141,166,169,203,169,203 C132,233,123,281,125,298 C98,317,101,377,122,384 C113,405,143,422,175,405 C175,405,183,418,195,419 C226,421,296,417,305,404 C333,402,398,352,416,353 C437,355,450,313,411,310" />
+    <path
+        android:fillColor="#fff"
+        android:pathData="M172,399 C180,392,184,367,184,367 L195,377 S175,387,185,405 L172,399" />
+</vector>
\ No newline at end of file
diff --git a/images/reference/Backbone_js_logo.svg b/images/reference/Backbone_js_logo.svg
new file mode 100644
index 00000000..6ddd969c
--- /dev/null
+++ b/images/reference/Backbone_js_logo.svg
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="900"
+   height="161"
+   id="svg2">
+  <defs
+     id="defs4" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     transform="translate(129.47008,-1148.7329)"
+     id="layer1">
+    <g
+       transform="matrix(0.17893165,0,0,0.17893165,-129.37356,1149.0013)"
+       id="Page 1"
+       style="fill:#d8d8d8;fill-rule:evenodd">
+      <g
+         id="BackBone.JS">
+        <path
+           d="M 0,0 0,485 361,690.78502 361,550.90277 119.49609,413.23549 119.49609,197 361,334.66728 361,205.78502 0,0 z m 0,0"
+           id="Path"
+           style="fill:#002a41;stroke:#848484;stroke-width:1" />
+        <path
+           d="M 722,0 722,485 361,690.78502 361,550.90277 602.50391,413.23549 602.50391,197 361,334.66728 361,205.78502 722,0 z m 0,0"
+           id="path2996"
+           style="fill:#0071b5;stroke:#848484;stroke-width:1" />
+        <path
+           d="m 0,896.78502 0,-485 L 361,206 l 0,139.88225 -241.50391,137.66728 0,205.23549 L 361,551.11775 361,691 0,896.78502 z m 0,0"
+           id="path2998"
+           style="fill:#0071b5;stroke:#848484;stroke-width:1" />
+        <path
+           d="m 722,896.78502 0,-485 L 361,206 l 0,139.88225 241.50391,137.66728 0,205.23549 L 361,551.11775 361,691 722,896.78502 z m 0,0"
+           id="path3000"
+           style="fill:#002a41;stroke:#848484;stroke-width:1" />
+      </g>
+    </g>
+  </g>
+</svg>
diff --git a/images/reference/heroku-logo-stroke-white.png b/images/reference/heroku-logo-stroke-white.png
new file mode 100644
index 00000000..3e305439
Binary files /dev/null and b/images/reference/heroku-logo-stroke-white.png differ
diff --git a/images/reference/index.md b/images/reference/index.md
index ffc5799a..a8c6c78d 100644
--- a/images/reference/index.md
+++ b/images/reference/index.md
@@ -140,4 +140,7 @@ Where possible this links to the organisation's brand guidelines page.
 | <img src="/images/svg/linux.svg" width="256" /> | <img src="/images/reference/Classic_flat_look_v1.1.svg" width="256" />  | https://www.linuxfoundation.org/trademark-usage/ |
 | <img src="/images/svg/imdb.svg" width="256" /> | <img src="/images/reference/imdb.svg" width="256" />  | https://imdb.com/ |
 | <img src="/images/svg/nhs.svg" width="256" /> | <img src="/images/reference/nhs-logo-digital-space.jpg" width="256" />  | https://www.england.nhs.uk/nhsidentity/identity-guidelines/nhs-logo/ |
+| <img src="/images/svg/yarn.svg" width="256" /> | <img src="/images/reference/yarn_pkg.svg" width="256" />  | https://yarnpkg.com/en/ |
+| <img src="/images/svg/backbone.svg" width="256" /> | <img src="/images/reference/Backbone_js_logo.svg" width="256" />  | https://backbonejs.org/ |
+| <img src="/images/svg/heroku.svg" width="256" /> | <img src="/images/reference/heroku-logo-stroke-white.png" width="256" />  | https://brand.heroku.com/ |
 | <img src="/images/svg/go.svg" width="256" /> | <img src="/images/reference/Go-Logo_Blue.svg" width="256" />  | https://blog.golang.org/go-brand |
diff --git a/images/reference/yarn_pkg.svg b/images/reference/yarn_pkg.svg
new file mode 100644
index 00000000..a98ded56
--- /dev/null
+++ b/images/reference/yarn_pkg.svg
@@ -0,0 +1,12 @@
+<svg class="logo navbar-logo" xmlns="http://www.w3.org/2000/svg" xmlns:x="http://www.w3.org/1999/xlink"
+
+viewBox="0 0 518 518">
+
+  <defs>
+<path id="main" fill="#117cad" d="M259 0c143 0 259 116 259 259S402 518 259 518 0 402 0 259 116 0 259 0z"></path> 
+  </defs>
+
+  <use class="logo-primary" x:href="#main" x="0" y="0"></use>
+
+  <path class="logo-secondary" fill="white" d="M435.2 337.5c-1.8-14.2-13.8-24-29.2-23.8-23 .3-42.3 12.2-55.1 20.1-5 3.1-9.3 5.4-13 7.1.8-11.6.1-26.8-5.9-43.5-7.3-20-17.1-32.3-24.1-39.4 8.1-11.8 19.2-29 24.4-55.6 4.5-22.7 3.1-58-7.2-77.8-2.1-4-5.6-6.9-10-8.1-1.8-.5-5.2-1.5-11.9.4C293.1 96 289.6 93.8 286.9 92c-5.6-3.6-12.2-4.4-18.4-2.1-8.3 3-15.4 11-22.1 25.2-1 2.1-1.9 4.1-2.7 6.1-12.7.9-32.7 5.5-49.6 23.8-2.1 2.3-6.2 4-10.5 5.6h.1c-8.8 3.1-12.8 10.3-17.7 23.3-6.8 18.2.2 36.1 7.1 47.7-9.4 8.4-21.9 21.8-28.5 37.5-8.2 19.4-9.1 38.4-8.8 48.7-7 7.4-17.8 21.3-19 36.9-1.6 21.8 6.3 36.6 9.8 42 1 1.6 2.1 2.9 3.3 4.2-.4 2.7-.5 5.6.1 8.6 1.3 7 5.7 12.7 12.4 16.3 13.2 7 31.6 10 45.8 2.9 5.1 5.4 14.4 10.6 31.3 10.6h1c4.3 0 58.9-2.9 74.8-6.8 7.1-1.7 12-4.7 15.2-7.4 10.2-3.2 38.4-12.8 65-30 18.8-12.2 25.3-14.8 39.3-18.2 13.6-3.3 22.1-15.7 20.4-29.4zm-23.8 14.7c-16 3.8-24.1 7.3-43.9 20.2-30.9 20-64.7 29.3-64.7 29.3s-2.8 4.2-10.9 6.1c-14 3.4-66.7 6.3-71.5 6.4-12.9.1-20.8-3.3-23-8.6-6.7-16 9.6-23 9.6-23s-3.6-2.2-5.7-4.2c-1.9-1.9-3.9-5.7-4.5-4.3-2.5 6.1-3.8 21-10.5 27.7-9.2 9.3-26.6 6.2-36.9.8-11.3-6 .8-20.1.8-20.1s-6.1 3.6-11-3.8c-4.4-6.8-8.5-18.4-7.4-32.7 1.2-16.3 19.4-32.1 19.4-32.1s-3.2-24.1 7.3-48.8c9.5-22.5 35.1-40.6 35.1-40.6s-21.5-23.8-13.5-45.2c5.2-14 7.3-13.9 9-14.5 6-2.3 11.8-4.8 16.1-9.5 21.5-23.2 48.9-18.8 48.9-18.8s13-39.5 25-31.8c3.7 2.4 17 32 17 32s14.2-8.3 15.8-5.2c8.6 16.7 9.6 48.6 5.8 68-6.4 32-22.4 49.2-28.8 60-1.5 2.5 17.2 10.4 29 43.1 10.9 29.9 1.2 55 2.9 57.8.3.5.4.7.4.7s12.5 1 37.6-14.5c13.4-8.3 29.3-17.6 47.4-17.8 17.5-.3 18.4 20.2 5.2 23.4z"></path>
+</svg>
\ No newline at end of file
diff --git a/images/svg/backbone.svg b/images/svg/backbone.svg
new file mode 100644
index 00000000..f67e1377
--- /dev/null
+++ b/images/svg/backbone.svg
@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="Backbone" role="img"
+viewBox="0 0 512 512" fill="#0071b5"><rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/><g stroke="#848484" stroke-width="2"><path d="M380 102v167l-124 70v-48l83-47v-74l-83 47v-44l124-71"/><path fill="#002a41" d="M132 102v167l124 70v-48l-83-47v-74l83 47v-44l-124-71M380 410V243l-124-70v48l83 47v71l-83-48v48l124 71"/><path d="M132 410V243l124-70v48l-83 47v71l83-48v48l-124 71"/></g></svg>
\ No newline at end of file
diff --git a/images/svg/heroku.svg b/images/svg/heroku.svg
new file mode 100755
index 00000000..ab392210
--- /dev/null
+++ b/images/svg/heroku.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="Heroku" role="img"
+viewBox="0 0 512 512" fill="#430098"><rect
+width="512" height="512"
+rx="15%"/><path d="M367 99H145c-22 0-30 8-30 30v254c0 22 8 30 30 30h222c22 0 30-8 30-30V129c0-22-9-30-30-30" stroke="#fff" stroke-width="16"/><path fill="#fff" d="M182 284c56-28 94-31 107-25 9 4 9 15 9 15v99h33V273s-1-32-27-44-62-1-88 6v-95h-34m124 54s22-22 25-54h-34c-5 29-25 54-25 54m-90 178l37-33-37-33"/></svg>
\ No newline at end of file
diff --git a/images/svg/yarn.svg b/images/svg/yarn.svg
new file mode 100644
index 00000000..bd8a2694
--- /dev/null
+++ b/images/svg/yarn.svg
@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="Yarn" role="img"
+viewBox="0 0 512 512" fill="#117cad"><rect
+width="512" height="512"
+rx="15%"/><path stroke="#fff" stroke-width="16" d="M411 310c-23-4-70 34-82 34 0 0 11-53-33-102 43-61 32-120 24-137-10-19-24-7-24-7s-24-75-56 2c-39-2-47 25-72 35-27 31 1 68 1 68-37 30-46 78-44 95-27 19-24 79-3 86-9 21 21 38 53 21 0 0 8 13 20 14 31 2 101-2 110-15 28-2 93-52 111-51 21 2 34-40-5-43"/><path fill="#fff" d="M172 399c8-7 12-32 12-32l11 10s-20 10-10 28l-13-6"/></svg>
\ No newline at end of file