diff --git a/libraries/LIBRARIES.txt b/libraries/LIBRARIES.txt
new file mode 100644
index 00000000..8905553b
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+++ b/libraries/LIBRARIES.txt
@@ -0,0 +1,7 @@
+iteration-composition	Iteration, composition
+list-utilities	List utilities
+stream-tools	Streams (lazy lists)
+variadic-reporters	Variadic reporters
+word-sentence	Words, sentences
+cases	Multi-branched conditional (switch)
+leap-library LEAP Motion controller
diff --git a/libraries/cases.xml b/libraries/cases.xml
new file mode 100644
index 00000000..8a170f7b
--- /dev/null
+++ b/libraries/cases.xml
@@ -0,0 +1 @@
+<blocks app="Snap! 4.0, http://snap.berkeley.edu" version="1"><block-definition s="cases: if %&apos;test&apos; then %&apos;result&apos; %&apos;more&apos;" type="command" category="control"><header></header><code></code><inputs><input type="%b"></input><input type="%cs"></input><input type="%mult%boolUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doRun"><block var="result"/><list></list></block></script><script><custom-block s="catch %upvar %cs"><l>tag</l><script><custom-block s="for each %upvar of %l %cs"><l>item</l><block var="more"/><script><block s="doIf"><block s="evaluate"><block var="item"/><list></list></block><script><custom-block s="throw %s"><block var="tag"/></custom-block></script></block></script></custom-block></script></custom-block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="else if %&apos;test&apos; then %&apos;action&apos;" type="predicate" category="control"><header></header><code></code><inputs><input type="%b"></input><input type="%cs"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doRun"><block var="action"/><list></list></block><block s="doReport"><block s="reportTrue"></block></block></script><script><block s="doReport"><block s="reportFalse"></block></block></script></block></script></block-definition><block-definition s="else %&apos;action&apos;" type="predicate" category="control"><header></header><code></code><inputs><input type="%cs"></input></inputs><script><block s="doRun"><block var="action"/><list></list></block><block s="doReport"><block s="reportTrue"></block></block></script></block-definition></blocks>
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diff --git a/libraries/leap-library.xml b/libraries/leap-library.xml
new file mode 100644
index 00000000..b8252204
--- /dev/null
+++ b/libraries/leap-library.xml
@@ -0,0 +1 @@
+<blocks app="Snap! 4.0, http://snap.berkeley.edu" version="1"><block-definition s="Leap $flag" type="command" category="other"><header></header><code></code><inputs></inputs><script><block s="doRun"><block s="reportJSFunction"><list></list><block s="reportURL"><l>crossorigin.me/http://js.leapmotion.com/leap-0.6.4.min.js</l></block></block><list></list></block><block s="doRun"><block s="reportJSFunction"><list></list><l>window.controller = new Leap.Controller({enableGestures: true, background: true}); window.controller.connect();</l></block><list></list></block></script></block-definition><block-definition s="Leap number of hands" type="reporter" category="other"><header></header><code></code><inputs></inputs><script><block s="doReport"><block s="evaluate"><block s="reportJSFunction"><list></list><l>return window.controller.frame(0).hands.length;</l></block><list></list></block></block></script></block-definition><block-definition s="Leap %&apos;pos&apos; position of hand %&apos;num&apos;" type="reporter" category="other"><header></header><code></code><inputs><input type="%txt">x</input><input type="%n">1</input></inputs><script><block s="doDeclareVariables"><list><l>a</l></list></block><block s="doIfElse"><block s="reportAnd"><block s="reportListContainsItem"><block s="reportNewList"><list><l>x</l><l>y</l><l>z</l></list></block><block var="pos"/></block><block s="reportNot"><block s="reportGreaterThan"><block var="num"/><custom-block s="Leap number of hands"></custom-block></block></block></block><script><block s="doReport"><block s="evaluate"><block s="reportJSFunction"><list><l>pos</l><l>num</l></list><l>var a = {x:0, y:1, z:2}[pos]; return window.controller.frame(0).hands[num-1].stabilizedPalmPosition[a];</l></block><list><block var="pos"/><block var="num"/></list></block></block></script><script><block s="doReport"><l>0</l></block></script></block></script></block-definition><block-definition s="Leap %&apos;pos&apos; rotation of hand %&apos;num&apos;" type="reporter" category="other"><header></header><code></code><inputs><input type="%txt">yaw</input><input type="%n">1</input></inputs><script><block s="doIfElse"><block s="reportAnd"><block s="reportListContainsItem"><block s="reportNewList"><list><l>yaw</l><l>pitch</l><l>roll</l></list></block><block var="pos"/></block><block s="reportNot"><block s="reportGreaterThan"><block var="num"/><custom-block s="Leap number of hands"></custom-block></block></block></block><script><block s="doReport"><block s="evaluate"><block s="reportJSFunction"><list><l>pos</l><l>num</l></list><l>var f = window.controller.frame(0);&#xD;switch (pos){&#xD;  case "yaw":&#xD;    return f.hands[num-1].yaw();&#xD; 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