Features:

v0.1.5609.13630 (5/11/2015 8:34AM PST)

Mods are always stored in an external folder, never in the GTAV directory
Mod location is configurable
Specific mods can be toggled on and off
Firewall rules are created to block GTA5.exe from the internet while mods are enabled
Social Club is automatically set to offline mode when mods are enabled
Mods can be automatically removed as soon as you quit the game (configurable)
Config files can be edited directly in the manager
Ability to rename mods to friendly names
GTA5.exe high priority tweak one-click enabler
Online Mode which automatically disables all mods and opens the firewall
Drag and drop installation of mods (UAC enabled Windows 8+ does not allow this at this time)
Uninstall/Delete mods from within the manager
Automatic update notifications (will have auto updates working soon)