Here are the 10 fastest-growing work apps of 2018, according to $9 billion security company Okta

$7.79 billion RingCentral is a phone, team messaging and video conferencing system. This all-in-one system can be used to help teams collaborate and to help companies communicate better with customers.

Freshservice is an IT service desk product from the company Freshworks. It can be used to manage IT incidents and provide support via email, a self-service portal, phone, chat, or in person.

Atlassian has a wide range of products that companies use for software development, project management, teamwork, and code quality. The $24.5 billion company is most known for its project management and bug tracking software Jira, but also offers tools like code-sharing service BitBucket and document collaboration tool Confluence.

Adobe, the $123.76 billion computer software company, has a wide range of software products used for multimedia and creative projects, including Photoshop, Premiere, and Illustrator. It also offers software for digital marketing and managing documents.

Zoom is a cloud-based videoconferencing app that companies can use for meetings, video webinars, phone calls and team collaboration. Zoom is planning to go public very soon.

Jamf Pro is a tool that helps IT departments manage and secure their Apple devices, including Macs, iPads, iPhones and Apple TVs.

Proofpoint is a $6.27 billion cybersecurity company that helps companies respond to cyberattacks and threats, across email, the web, the cloud, and social media.

LastPass is a password manager that stores encrypted passwords online. It helps users remembers passwords so that users don't have to, and they can worry less about their accounts getting hacked or stolen. It can also generate secure passwords.

KnowBe4 provides security awareness training for companies and teams to help them manage IT security problems. These include social engineering, spear phishing and ransomware attacks. The program includes simulated phishing attacks that help users identify these problems.