Q: I enjoy interacting with students in f2f classroom by using clickers for example. How can I recreate this experience online?

A: It is challenging because the most powerful component of polling practice is a real-time feedback. In online classroom the polling still could be used to elicit information from students asynchronously to capture an overall mood of your virtual classroom. Look at some  tools that are available for free: 
TodaysMeet
Padlet
Poll Everywere
Polldaddy
Check the additional resources here.

Q: I am looking for more interactive ways of teaching a big size class. It is challenging to engage students with clickers because they are limited to multiple choice. Could you recommend more modern engaging platform to use?

A: Use Top Hat's response system to engage students via their cell phones. No Clickers Required.

Top Hat: Student Response and Engagement System

https://tophat.com/features

• Students can text their answers if they don't have smart phones.
• professor and 30 students are free.

Please read more here

Q: I want to find an alternative to clickers. What tool I can use in class to show the bell curve in real time?

A: You can use technology that students already own (laptops, cell phones). See the list of compatible tools below:

AdobeConnect: http://tv.adobe.com/watch/learn-adobe-connect/creating-a-poll/
Poll­Daddy: http://polldaddy.com Socra­tive: http://www.socrative.com/ Piazza: https://piazza.com/ ​ https://piazza.com/features#​
Lec­ture­Tools: http://www.lecturetools.com/ Ques­tion­Press: http://www.questionpress.com/ Learn­ing Cat­alyt­ics: https://learningcatalytics.com/ pollev­ery­where: http://www.polleverywhere.com/highered-student-response-system men­time­ter: http://mentimeter.com/ Celly: http://cel.ly/ eClick­ers: http://www.eclicker.com/ Turn­ingTech­nolo­gies Respon­se­Ware: http://www.turningtechnologies.com/studentresponsesystems/mobiledistancelearning/higheredresponseware/ Socra­tive: http://socrative.com/# Google Forms: docs.google.comhttps://sites.google.com/a/pjrprojects.co.uk/sitesguide/google-sites/how-tos/create-a-poll-using-google-formshttp://www.demogeek.com/2009/04/01/polls-made-easier-with-google-docs-spreadsheet/Top Hat Mon­o­cle: http://www.tophatmonocle.com/ GoSoap­Box: http://gosoapbox.com/tour iClicker Web Clicker:  http://www.iclicker.com/products/webclicker/ Click­er­School Vir­tual Clicker by Eduware: http://itunes.apple.com/us/app/clickerschool-virtual-clicker/id444020820?mt=8 Soda­Head Polls-WP plug-in:  http://wordpress.org/extend/plugins/sodahead-polls/ Pin­nion: http://www.pinnion.com/References:
http://blogs.princeton.edu/etc/2012/04/10/alternatives-to-physical-clickers-in-the-classroom/http://www.freetech4teachers.com/2011/10/three-alternatives-to-clicker-response.html#.UXm7AcolHuQ​

Q: How to use Clickers in classroom?

A: You need to register at http://clickers.asu.edu/ 

Some assistants will be assigned to help you and install software for your laptop.

Here is the link to a tutorial:

http://clickers.asu.edu/sites/default/files/file/tpbbreg.pdf