7 apps in 1kb! Mini Code Editor, HTML & CSS minifier, hex viewer, dataURI converter, spritesheet and JSPerf!
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/*
document.write this:
<iframe id=f></iframe>
<hr>mini
<textarea rows=9 onchange='for(i=5;i--;)value=value.replace(/<!.*?->|<\/[tl].>\s*|[\s/]*(^|$|>)\s*|(\s)\s|<\/p>\s*(?=<p>|$)/gi,"$1$2")'placeholder=HTML></textarea>
<textarea rows=9 onchange='for(i=5;i--;)value=value.replace(/^\s|\s$|\/\*[^]*?\*\/|\s*;*([^\:\w.#\x27"\s*-])\s*|(:) /g,"$1$2")'placeholder=css></textarea>
<hr>hex
<input rows=9 onchange='h="<pre>";with(new FileReader)readAsArrayBuffer(files[0]),onload=function(){for(i in u=new Uint8Array(result))h+=(i%16?" ":"\n"+(1e7+(+i)[t="toString"](16)).slice(-8)+" | ")+(0+u[i][t](16)).slice(-2);outerHTML=h}'type=file>
<hr>uri
<input rows=9 onchange='h="<pre>";with(new FileReader)readAsDataURL(files[0]),onload=function(){outerHTML=h+result}'type=file>
<hr>
sheet<script>function w(){for($=0;$<2;eval(Array(1e5).join(_4.value+"\n"+($++?_2:_3).value+"\n"+_1.value+"\n")),_0.value+="\n"+$+":"+(new Date-_)+"ms")_=new Date}function c(d){for(j in a)for(i in a)y=a[i]+-~j,d?b.innerHTML+=[["<br>"][i]]+"<input onfocus=value=[c[id]] onblur=c[id]=value;c() id="+y+" placeholder="+y+">":eval(y+(".value"+c[y]).replace(/[a-f]\d/g," +$&.value"))}for(i=3;i--;)f.outerHTML+="<textarea rows=9 id=t"+i+" placeholder='"+["HTML","css","js"][i]+"'>";onchange=function(){f.srcdoc=t0.value+"<script>"+t2.value+"<\/script><style>"+t1.value};c(a="abcdef");b.innerHTML+="<hr><button onclick=w()>jsperf";for(i=5;i--;)b.innerHTML+="<textarea rows=9 id=_"+i+" placeholder='"+["time","clean",2,1,"setup"][i]+"'>"</script>
*/