diff --git a/circle.md b/circle.md
index 45562e26..a6cdb47d 100644
--- a/circle.md
+++ b/circle.md
@@ -12,3 +12,83 @@ title: CircleCI
 * __deployment__: deploying your code to your web servers
 
 See: <https://circleci.com/docs/configuration>
+
+## Sample
+
+```yml
+## Customize the test machine
+machine:
+
+  timezone:
+    America/Los_Angeles # Set the timezone
+
+  # Version of ruby to use
+  ruby:
+    version:
+      1.8.7-p358-falcon-perf
+
+  # Override /etc/hosts
+  hosts:
+    circlehost: 127.0.0.1
+    dev.mycompany.com: 127.0.0.1
+
+  # Add some environment variables
+  environment:
+    CIRCLE_ENV: test
+    DATABASE_URL: postgres://ubuntu:@127.0.0.1:5432/circle_test
+
+## Customize checkout
+checkout:
+  post:
+    - git submodule sync
+    - git submodule update --init # use submodules
+
+## Customize dependencies
+dependencies:
+  pre:
+    - npm install coffeescript # install from a different package manager
+    - gem uninstall bundler # use a custom version of bundler
+    - gem install bundler --pre
+
+  override:
+    - bundle install: # note ':' here
+        timeout: 180 # fail if command has no output for 3 minutes
+
+  # we automatically cache and restore many dependencies between
+  # builds. If you need to, you can add custom paths to cache:
+  cache_directories:
+    - "custom_1"   # relative to the build directory
+    - "~/custom_2" # relative to the user's home directory
+
+## Customize database setup
+database:
+  override:
+    # replace CircleCI's generated database.yml
+    - cp config/database.yml.ci config/database.yml
+    - bundle exec rake db:create db:schema:load
+
+## Customize test commands
+test:
+  override:
+    - phpunit test/unit-tests # use PHPunit for testing
+  post:
+    - bundle exec rake jasmine:ci: # add an extra test type
+        environment:
+          RAILS_ENV: test
+          RACK_ENV: test
+
+## Customize deployment commands
+deployment:
+  staging:
+    branch: master
+    heroku:
+      appname: foo-bar-123
+
+## Custom notifications
+notify:
+  webhooks:
+    # A list of hashes representing hooks. Only the url field is supported.
+    - url: https://someurl.com/hooks/circle
+```
+
+See: <https://circleci.com/docs/config-sample>
diff --git a/perl-pie.md b/perl-pie.md
new file mode 100644
index 00000000..541f82f9
--- /dev/null
+++ b/perl-pie.md
@@ -0,0 +1,19 @@
+---
+title: Perl-pie
+category: Development
+---
+
+### Search and replace
+
+```sh
+perl -p -i -e 's/hello/hola/g' *.txt
+```
+
+### Back-referencing
+
+Use `\1` et al.
+
+```sh
+# '@include align-items(center);' => 'align-items: center;'
+perl -p -i -e "s/\@include (align-items)\((.*)\);/\1: \2;/g"
+```
diff --git a/riot.md b/riot.md
new file mode 100644
index 00000000..fd94a274
--- /dev/null
+++ b/riot.md
@@ -0,0 +1,151 @@
+---
+title: Riot.js
+category: JavaScript libraries
+---
+
+## Tags
+
+```js
+/* tag-name.tag */
+<tag-name>
+  <div>
+    hello {name}
+  </div>
+
+  this.name = opts.name
+</tag-name>
+```
+
+```html
+<!-- in html -->
+<tag-name>
+<script>riot.mount('*')</script>
+<script>riot.mount('tag-name')</script>
+<script>riot.mount('tag-name', { title: 'my app', ... })</script>
+```
+
+## Expressions
+
+```
+{value}
+{value || 'its a js expression'}
+
+<input checked={null}>   /* null values ignore the tag */
+<p class={ selected: true }>
+```
+
+### Loops
+
+```
+<li each={movies}>{title}</li>
+```
+
+### Conditional
+```
+<div if={error}>
+<div show={error}> /* show using display: '' */
+<div hide={error}> /* hide using display: none */
+```
+
+### Events
+
+```js
+<button onclick={go}>
+
+this.go = function (e) { ... }
+```
+
+## API
+
+```js
+this.update()
+this.update({ data: 'hi' }
+
+this.unmount()
+this.unmount(true) // keep parent tag
+
+riot.update() // update all
+```
+
+## Nesting
+
+```
+<my-tag>
+  <child></child>
+  var child = this.tags.child
+</my-tag>
+```
+
+### Names
+
+```
+<my-tag>
+  <child name='xyz'></child>
+  var child = this.tags.xyz
+</my-tag>
+```
+
+## Nested HTML
+
+```js
+<yield/>
+```
+
+### Yield to/from
+
+```js
+<post>
+  <yield to='title'>Hello</yield>
+  <yield to='body'>Hey there world</yield>
+</post>
+```
+
+```js
+<post>
+  <yield from='title'/>
+  <yield from='body'/>
+</post>
+```
+
+## Router
+
+```js
+riot.route('customers/*/edit', (id) => {
+})
+riot.route('customers/234/edit')
+riot.route.start()
+riot.route.start(true) // exec the current url
+```
+
+## Lifecycle
+
+```js
+this.on('before-mount', function() {
+// before the tag is mounted
+})
+
+this.on('mount', function() {
+// right after the tag is mounted on the page
+})
+
+this.on('update', function() {
+// allows recalculation of context data before the update
+})
+
+this.on('updated', function() {
+// right after the tag template is updated
+})
+
+this.on('before-unmount', function() {
+// before the tag is removed
+})
+
+this.on('unmount', function() {
+// when the tag is removed from the page
+})
+
+// curious about all events ?
+this.on('all', function(eventName) {
+console.info(eventName)
+})
+```