These tools are experimental and subject to breaking changes.

The AutotoolsDeps is the dependencies generator for Autotools. It will generate shell scripts containing environment variable definitions that the autotools build system can understand.

The AutotoolsDeps generator can be used by name in conanfiles:
class Pkg(ConanFile):
    generators = "AutotoolsDeps"

And it can also be fully instantiated in the conanfile generate() method:

from conans import ConanFile
from import AutotoolsDeps

class App(ConanFile):
    settings = "os", "arch", "compiler", "build_type"

    def generate(self):
        tc = AutotoolsDeps(self)

The AutotoolsDeps will generate after a conan install command the or conanautotoolsdeps.bat files:

$ conan install # default is Release
$ source
# or in Windows
$ conanautotoolsdeps.bat

This generator will define aggregated variables CPPFLAGS, LIBS, LDFLAGS, CXXFLAGS, CFLAGS that accumulate all dependencies information, including transitive dependencies, with flags like -I<path>, -L<path>, etc.

At this moment, only the requires information is generated, the build_requires one is not managed by this generator yet.