New on the list last year, up 22 places this year

Stack Overflow is community of IT developers where they go too learn, share their knowledge, and build their careers.

Website: stackoverflow.com
Cost: Free
Availability: Online

Top 100 Tools for Personal & Professional Learning 2019: –
Top 100 Tools for Workplace Learning 2019: 49
Top 100 Tools for Education 2019: –

Past Overall Rankings
2018: 106   2017: –     2016: –    2015: –    2014: –    2013: –
2012: –       2011: –     2010: –    2009: –    2008: –    2007: –

Comments from some of those who selected Stack Overflow as one of their Top 10 Tools in 2019

“Excellent resource of user-contributed solutions.” Developer, USA