Top 50 Guest Blogging Sites 2018

Content Marketing Institue: Submission guidelines

HubSpot: Submission guidelines

Outbrain: Submission guidelines

Copyblogger.com: Submit Guest Post

Smashing Magazine: Guest post guidelines

Inc42: Contact for guest post

YourStory: Submit guest post

Daily Blog Tips: Daily Blog Tips | Submit Guest Post

InBound.org: Read guidelines before submitting

Kissmetrics: Submission guidelines

The Huffington Post: Submission Guidelines

The Sits girls: How to submit

HellBound Bloggers: Write for us

More Blogs on Blogging/Marketing:
The Write life: Submission Guidelines (We’re a one-stop writing shop, covering topics like freelancing, marketing, publishing, self-publishing, blogging and more.”)

Inspiration2Feed : Submit guest post

Marketing Profs: Submit guest post

Small Biz Trends: Submit guest post

Technology

Readwrite : Readwrite.com | Submit Guest Post

ShoutMeTech: ShoutMeTech.com | Submit Guest Post

iAmWire: Submit guest post

TechWyse:: TechWyse.com | Submit guest post

SEO

Moz Blog: Moz.com | Submit Guest Post

Social Media
Social Media Today: Socialmediatoday.com | Submit Guest Post

Social Media Examiner : Socialmediaexaminer.com | Submit Guest Post

Designing
Onextrapixel: Onextrapixel.com | Submit Guest Post

Webdesignledger: Webdesignledger.com | Submit Guest Post

Webanddesigners: Webanddesigners.com | Submit Guest Post

Skyje: Skyje.com | Submit Guest Post

Random blogs:
Scary Mommy(Parenting & pregnancy niche)

Hope this will surely help you.