Here is a list of some notable DevOps as a Service companies.

1. OpenXcell: A top resource hiring and software development company based in the USA, known for providing highly skilled IT talent with over ten years of domain experience.

2. IT Svit: Started in 2005, this company offers DevOps and Big Data services. Based in Ukraine and Estonia, IT Svit has completed over 800 successful projects.

3. Tasrie IT Services: Specializing in Cloud-DevOps, this UK-based company focuses on helping businesses of all sizes harness the power of the cloud for growth and innovation.

4. Quema: A European company specializing in DevOps services, combining development and DevOps roles for effective IT infrastructure building.

5. Alpacked: Focused on DevOps and Cloud best practices, this Ukrainian company believes in the future of cloud technology and offers various related services.

6. Code&Care: A US-based company that offers first-class development services for corporations and startups, focusing on cutting-edge software and top-notch platforms.

7. Onjection Labs Private Limited: An Indian company offering DevOps services that rationalize software development processes by bringing together development and operations teams.

8. TopSquad: Specializing in delivering IT solutions customized for established companies, TopSquad is based in Vietnam and was established in 2008.

9. Dataforest: A Ukrainian Data Engineering and Web Product Development agency that focuses on data-driven solutions, combining Data Science and AI techniques.

10. DevOps Enabler & Co.: An ISO 27001:2013 certified organization and a Microsoft Gold partner in DevOps competency, this Indian company focuses on software delivery automation.

11. IAMOPS: Offering dedicated DevOps teams for startups and high-growth companies in Israel and the United States.

12. Relout: A Site Reliability and DevOps agency from Poland, specializing in managed infrastructure services and consulting.

13. INOSTUDIO: A Russian software development company providing full cycle development services since 2006.

14. Nuage Biztech Pvt. Ltd.: An Indian boutique tech provider working with startups and small-medium businesses, focusing on Agile Development and DevSecOps.

15. Devopsbay: Based in Poland, they build software tailored to individual needs and offer world-quality engineers.

16. Perimattic LLC: A US-based Cloud Managed Service Provider specializing in AWS services.

17. AgileOps: Focusing on Atlassian, AWS, Kubernetes Services for businesses, AgileOps is based in Vietnam.

18. Ignatiuz Software: A US-based modern software and services company offering technology solutions with a partner-centric approach.

19. Netframe: Specializing in Software and Web development, Odoo CRM/ERP development, and DevOps services, this company is based in Latvia.

20. byVoice: A Polish software development company specializing in Cloud PBX and AI-driven solutions.

21. Next Big Technology(NBT): An Indian premium Web & App Development firm established in 2009.

22. Successive Digital: An Indian technology consulting services company focusing on digital transformation solutions.

23. Xiztdevops: Offering DevOps services, Xiztdevops is based in Kazakhstan and focuses on implementing software development solutions and innovations.

24. Bluelight Consulting: A US-based company offering Nearshore DevOps & Software Development, helping startups and enterprises with cutting-edge solutions.

25. Protonshub Technologies: This US-based company is a CMMI Level 5 custom software development firm creating innovative solutions for businesses.

26. SlashTec: Based in the UAE, SlashTec is a Managed Service Provider and Technology Consultancy focusing on DevOps As A Service and Managed cloud hosting.

27. Rootstrap, Inc.: A company that helps enterprises scale through outcome-driven development, Rootstrap has worked with clients like Disney, Salesforce, and Google.

These companies vary in their specialties, geographic locations, and the scale of projects they handle. Selecting the right DevOps as a Service provider will depend on your specific needs, budget, and preferred working style.