TModLoader

tModLoader is a free Modding Tool that is developed by TML team and released by them as a standalone program or by Re-Logic as a DLC. It can be used to download Mods from their database (which is called "Mod Browser"), recieve updates on Mods if there are any, or upload your own Mods to the Mod Browser. mods that is made in tModloader can be seen in mods page