AWS Public IP Address Ranges Now Available in JSON Form

Amazon Web Services (AWS) publishes its current IP address ranges in JSON format. 

To view the current ranges, download the .json file. To maintain history, save successive versions of the  .json file on your system. To determine whether there have been changes since the last time that you saved the file, check the publication time in the current file and compare it to the publication time in the last file that you saved.

Reference:

1. http://aws.amazon.com/blogs/aws/aws-ip-ranges-json/

The BigBlueButton for Virtual Classroom

BigBlueButton is an open source web conferencing system developed primarily for distance education.It supports multiple audio and video sharing, presentations with extended whiteboard capabilities - such as

• pointer
• zooming and drawing
• public and private chat 
• desktop sharing
• integrated VoIP 
• support for presentation of PDF documents and Microsoft Office documents. 

Users may enter the conference in one of two roles: viewer or moderator.

As a viewer, a user may join the voice conference, share their webcam, raise their hand, and chat with others. As a moderator, a user may mute/unmute others, eject any user from the session, and make any user the current presenter.

The presenter may upload slides and control the presentation.

Although its components are open source, the BigBlueButton client depends on a browser plugin for the Adobe Flash platform. The BigBlueButton server runs on Ubuntu 10.04 64-bit and can be installed either from source code or from Ubuntu packages. BigBlueButton is also downloadable as a Virtual Machine (VM) that runs within VMware Player on PC and Unix computers and within VMWare Fusion on Macs. The BigBlueButton server can also run within a cloud environment, such as Amazon EC2, by installing it on an Ubuntu 10.04 64-bit instance.

Recommend installation of  BigBlueButton on a dedicated (non-virtual) server for optimal performance.

1. 4 GB (or more of memory)
2. Quad-core 2.6 GHZ CPU (or faster)
3. Ports 80, 1935, 9123 accessible
4. Port 80 is not used by another application
5. 500G of free disk space (or more) for recordings
6. Minimum of 100 MBits/sec bandwidth

Sample window:

Reference:

1. Official Website
2. DemoLink 
3. Faq
4. Installation on Ubuntu
5. Installation on Windows
6. Concurrent users                                    

Evernote, a superb note taking tool

Evernote is a suite of software and services, designed for notetaking and archiving.

A "note" can be a piece of formatted text, a full webpage or webpage excerpt, a photograph, a voice memo, or a handwritten "ink" note. Notes can also have file attachments. Notes can be sorted into folders, then tagged, annotated, edited, given comments, searched and exported as part of a notebook. 

Evernote supports a number of operating system platforms (including OS X, iOS, Chrome OS, Android, Microsoft Windows, Windows Phone, BlackBerry, and webOS) and also offers online synchronisation and backup services.

We can create a collaborative hub for our team to brainstorm, develop, and launch projects with business notebooks.

Other products from evernote team includes Skitch, Penultimate, Evernote Web Clipper, Evernote Hello, Evernote Food,  Evernote Clearly and Evernote Peek.

Key features of Evernote: 

1.Create text, photo and audio notes 

2.Clip web pages including text, links, and images 

3.Synchronize your notes across your devices(Pc, Mobiles,Tablets etc) 

4.Search for text within snapshots and images