Gvim definitely has folding support. Not sure about projects. It does have support for Ant build files. However, I just recently moved over to gvim from emacs so I know only bits and pieces about vim.

GNU Emacs has support for all the features that OP asked for.

In reply to Re^3: Cross-platform development: editors by data64
in thread Cross-platform development: editors by radiantmatrix

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