Yes, both OneDesk and Notion offer a Free Trial.
OneDesk is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for OneDesk Starts at $12/user/month when yearly whereas for Notion Starts at $4/Month when Billed Yearly.
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.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.