Awfice is a collection of tiny office suite apps:
A simple rich text editor. Type whatever you want, it won't be saved anywhere, but it might be convenient for quick throwaway notes. You should be able to use Ctrl+B and Ctrl+I to mark text selection as bold or italic. Undo/redo should work as well. You can also copy/paste text and images from other sources.
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data:text/html,<body contenteditable style=line-height:1.5;font-size:20px>A very basic spreadsheet with math formulas. It has 100 rows and 26 columns (A..Z). If the value in the cell starts with an "=" = it is evaluated as a formula. You may refer to other cell values, i.e. "=(A10+A11)/A12". Under the hood it uses eval(), so be careful.
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data:text/html,<table id=t><script>z=Object.defineProperty,p=parseFloat;for(I=[],D={},C={},q=_=>I.forEach(e=>{try{e.value=D[e.id]}catch(e){}}),i=0;i<101;i++)for(r=t.insertRow(-1),j=0;j<27;j++)c=String.fromCharCode(65+j-1),d=r.insertCell(-1),d.innerHTML=i?j?"":i:c,i*j&&I.push(d.appendChild((f=>(f.id=c+i,f.onfocus=e=>f.value=C[f.id]||"",f.onblur=e=>{C[f.id]=f.value,q()},get=_=>{v=C[f.id]||"";if("="!=v.charAt(0))return isNaN(p(v))?v:p(v);with(D)return eval(v.slice(1))},a={get},z(D,f.id,a),z(D,f.id.toLowerCase(),a),f))(document.createElement`input`)))</script><style>#t{border-collapse:collapse}td{border:1px solid gray;text-align:right}input{border:none;width:4rem;text-align:center}</style>Nothing simpler than drawing on a blank canvas with mouse. Works with touch screens as well. To save your results... well, do a screenshot maybe...
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data:text/html,<canvas id=v><script>d=document,d.body.style.margin=0,P="onpointer",c=v.getContext`2d`,v.width=innerWidth,v.height=innerHeight,c.lineWidth=2,f=0,d[P+"down"]=e=>{f=e.pointerId+1;e.preventDefault();c.beginPath();c.moveTo(e.x,e.y)};d[P+"move"]=e=>{f==e.pointerId+1&&c.lineTo(e.x,e.y);c.stroke()},d[P+"up"]=_=>f=0</script></canvas>Just a variant of a rich text editor with some hotkeys. There are 50 blank slides for you (I hope you don't need to bore your audience with more slides). Each slide is a rich text editor, but there are some hotkeys to make styling better:
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data:text/html,<body><script>d=document;for(i=0;i<50;i++)d.body.innerHTML+='<div style="position:relative;width:90%;padding-top:60%;margin:5%;border:1px solid silver;page-break-after:always"><div contenteditable style=outline:none;position:absolute;right:10%;bottom:10%;left:10%;top:10%;font-size:5vmin>';d.querySelectorAll("div>div").forEach(e=>e.onkeydown=e=>{n=e.ctrlKey&&e.altKey&&e.keyCode-49,f="formatBlock",j="justify",x=[f,f,j+"Left",j+"Center",j+"Right","outdent","indent","insertUnorderedList"][n],y=["<h1>","<div>"][n],x&&d.execCommand(x,!1,y)})</script><style>@page{size:6in 8in landscape}@media print{*{border:0 !important}}A simple code editor. You can type in HTML, CSS & Javascript.
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data:text/html,<body oninput="i.srcdoc=h.value+'<style>'+c.value+'</style><script>'+j.value+'</script>'"><style>textarea,iframe{width:100%;height:50%;}body{margin:0;}textarea{width: 33.33%;font-size:18px;padding:0.5em}</style><textarea placeholder="HTML" id="h"></textarea><textarea placeholder="CSS" id="c"></textarea><textarea placeholder="JS" id="j"></textarea><iframe id="i"></iframe><script>document.querySelectorAll("textarea").forEach((t)=>t.addEventListener("keydown",function(t){var e,s;"Tab"==t.key&&(t.preventDefault(),e=this.selectionStart,s=this.selectionEnd,this.value=this.value.substring(0,e)+" "+this.value.substring(s),this.selectionStart=this.selectionEnd=e+1)}))</script></body>A simple calculator which supports the basic operational symbol to calculate.
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data:text/html,<table style="text-align: center;width:80vw;margin: 0 auto;"><tbody><tr><td colspan="4"><textarea></textarea></td></tr></tbody><script>let d=document;let tbl=d.querySelector('tbody');let z=d.querySelector('textarea');let oc=(x)=>z.value+=x;let cl=()=>z.value='';let re=()=>{try{z.value=eval(z.value);}catch(error){cl();}};[[1,2,3,'+'],[4,5,6,'-'],[7,8,9,'*'],['C',0,'=','/']].forEach((a)=>{let r=d.createElement('tr');r.style.lineHeight='64px';tbl.appendChild(r);a.forEach((b)=>{let tb=d.createElement('tb');tb.innerText=b;tb.style.padding='16px';tb.style.border='1px solid';r.appendChild(tb);tb.onclick=b==='='?re:b==='C'?cl:()=>oc(b);})})</script></table>The code is distributed under MIT license. PRs are always welcome, especially if they fix something or make the code smaller, or add features that are valuable, but do not require a lot of code.
To modify something - edit HTML files directly. There is README.sh script that re-generates the README and embeds apps code into it.