Yes, both Notion and OneDesk offer a Free Trial.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
OneDesk is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Notion Starts at $4/Month when Billed Yearly whereas for OneDesk Starts at $12/user/month when yearly.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.
Some top alternatives to OneDesk includes Smartsheet, Miro, Process Street, Wrike, Notion, Freshbooks, Jira, TeamGantt, Zoho Projects, Teamwork, ProjectManager.com, Backlog, Worksuite, Quick Base, ClickUp, Resource Guru, Jira Service Desk, HelpDesk, HESK, Height and Scopedesk.