Important Links
Some useful resources that I've come across
Digrams
- diagrams.net - An online tool for creating block diagrams with support for Google Drive integration and no watermarking. Previously, it was known as draw.io
 - creatly.com - Another tool for creating block diagrams (but has watermarking for the free edition)
 - flockdraw - Collaborative drawing tool. (Site is now dead. RIP)
 
Online editing
- hackmd.io - An online collaborative markdown editor which has lots of nice feature like support for flowcharts and graphviz and many more
 - Overleaf - Online collaborative Latex editor
 - swipe.to - Create presentations in Markdown
 - gitbook.com - A WYSIWYG documentation creator with markdown support
 
Networking
- ipmango - Quickly check IP location and whois
 - ipinfo.io - Similar to ipmango but has support for 
curl