That said, I assume you are looking for a tool specializing in roadmap. If so, have you tried Prodpad or ProductBoard? ProductBoard is popular among the product manager community.
There is also several roadmap plugins in JIRA.
Here is one that handles dependencies https://marketplace.atlassian.com/apps/1212136/advanced-road...
As far as tooling goes, smartsheets sucks and omniplan is really good !