Nodeaccess
User's can grant access to other user's and roles, per node.
Modules
Advanced Access
Pluggable access system.
Entity Bundle Permissions
Allow access to bundles, if not already allowed.
Entity Type Permissions
Tweaks Entity Bundle Permissions module.
Content Access
Granular content access permissions.
This module tries to do too much and has a lot of issues.
Project updates
Use Group module for content access
Project
An account may need to share data with multiple users.
If content is in a group, it can be hidden to outside users.
Freelancers or...