No, I meant the EasyRPG project. The 0.1 release is from 2013, but work on the interpreter started much earlier and I remember watching development threads at least six or seven years before that.

EDIT: I found an interview from 2008 with the project creator (https://comunidad.rpgmaker.es/d/8745-entrevista-a-delapipol-..., in Spanish) where he states that “it was around 2005 that we thought of making a free alternative to Enterbrain’s RPG Maker”.

No, the grand poster was right about this being created in the mid 2000s, and he didn't confuse EasyRPG with RPG Maker. If you had just clicked on the "Blog" link of the official page, you'd seen that the blog was created in 2010.

Searching the web, I found the old forge (same project name, same first developer name) at Google Code Archive. The oldest commit is dated 2006-01-16, so it's at least that old.