Am I missing something? Add it!

• http://papercall.io/cfps mostly Dev/DevOps
• https://calltospeakers.com/ Mostly dev/languages
• http://wikicfp.com/cfp/ More on the academic side of things
• http://devopsconferences.org/
• https://opensource.com/resources/conferences-and-events-monthly Calendar which sometimes has CFPs

Mailing lists with CFPs

• https://tinyletter.com/techspeak
• http://sreweekly.com
• http://www.devopsweekly.com/
• https://thecfpreport.com/
• https://lwn.net/