As Millénaire aims to fill the wilderness of minecraft with NPC controlled villages with which you can interact in many different ways, OTG on the other hand focuses on landscapes and the "look and feel" of your world.
With the combination of these two mods u can create unique landscapes filled with lively scenic villages and many other structures.
With Journeymap included u can mark and waypoint your favorite Millénaire structures & OTG Landscapes.

A little bit more on each mod below

Open Terrain Generator (OTG)

OTG is an advanced, fully customizable world generator. Through its various configuration files it gives the user control over almost every aspect of Minecraft's terrain and structure generation, allowing you to generate anything from floating islands to cave worlds.

 

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Millénaire

 

Millénaire aims to fill the "emptiness" of Minecraft worlds by adding NPC villages to it, with loose 11th-century Norman, Indian, Japanese, Mayan, Byzantine and Inuit themes and additional cultures planned.

Villages are populated with men, women and children of various kinds, who perform tasks such as trading with the player, expending current buildings or improving existing ones, cultivating crops such as wheat in Norman villages and rice in Indian ones, crafting tools and powerful amulets, etc. As the village expends, the number of villagers increases as couples have children who grow up into new adults.

Help villages grow by trading with them and be rewarded with unique items such as Norman and Indian food or statues and tapestries to decorate your house with. And if they start liking you enough, they might even build you a house of your own.

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JourneyMap

 
Journeymap is a mod which maps your Minecraft world in real-time as you explore. You can view the map in a web browser or in-game as a Minimap or full-screen.
The main use for this is to mark your msot important locations on the minimap aswell as scout the nearby areas for points of interest.