In this article, I have added few top DevOps tools which are used across industry commonly. There are other tools as well depends on the usage.
GIT

GIT is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency. Git is easy to learn and has a tiny footprint with lightning fast performance.
JENKINS

Jenkins – an open source automation server which enables developers around the world to reliably build, test, and deploy their software.
SELENIUM

Selenium automates browsers. That’s it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that.
DOCKER

Docker is a set of platform-as-a-service products that use OS-level virtualisation to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels.
PUPPET

From automating simple tasks to securing global infrastructureEnd soul-crushing manual tasks. Automate away the mundane parts of your job, and spend more time doing things robots can’t do.
ANSIBLE

DevOps Tools Integration with Ansible: Automate across a wide variety of DevOps services and applications that are locally hosted or delivered as SaaS.
ELK STACK

ELK is the acronym for three open source projects: Elasticsearch, Logstash, and Kibana. Elasticsearch is a search and analytics engine. Logstash is a server‑side data processing pipeline that ingests data from multiple sources simultaneously, transforms it, and then sends it to a “stash” like Elasticsearch. Kibana lets users visualize data with charts and graphs in Elasticsearch.
The Elastic Stack is the next evolution of the ELK Stack.
SPLUNK

Splunk (the product) captures, indexes, and correlates real-time data in a searchable repository from which it can generate graphs, reports, alerts, dashboards, and visualisations. Splunk is a horizontal technology used for application management, security and compliance, as well as business and web analytics.