kiku (pronounced key cue) is a simple GPL speech recognition software.

A binary package (Debian) is available here:
http://www.workinprogress.ca/kiku/download/

Videos of kiku in action:
http://www.workinprogress.ca/kiku/video/

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COMPILATION:
It's doable, but i wouldn't say it's easy.
Follow those steps (adjust paths):

Dependencies:
apt-get install build-essential git-core subversion cvs libgtk2.0-dev flex libxtst-dev libasound2-dev codelite liblo-dev libnotify-dev libxosd-dev libgconf2-dev libpulse-dev

1) Fetch kiku
mkdir -p ~/src && cd ~/src
git clone https://github.com/patricksebastien/kiku.git 


2) Download & Install wxWidgets
https://github.com/wxWidgets/wxWidgets/archive/WX_2_9_0_BRANCH.zip

PATCH
open src/unix/utilsunx.cpp:
	//data->exitcode = DoWaitForChild(data->pid, WNOHANG);
	data->exitcode = DoWaitForChild(data->pid);

include/wx/textentry.h
	bool AutoComplete(const wxArrayString& choices, int minimumkey = 1)
			{ return DoAutoCompleteStrings(choices, minimumkey); }   
	virtual bool DoAutoCompleteStrings(const wxArrayString& WXUNUSED(choices), int WXUNUSED(minimumkey))
			{ return false; }
        
src/gtk/textentry.cpp
	bool wxTextEntry::DoAutoCompleteStrings(const wxArrayString& choices, int minimumkey)
	{
		GtkEntry * const entry = GTK_ENTRY(GetEditable());
		wxCHECK_MSG(entry, false, "auto completion doesn't work with this control");
	 
		GtkListStore * const store = gtk_list_store_new(1, G_TYPE_STRING);
		GtkTreeIter iter;
	 
		for ( wxArrayString::const_iterator i = choices.begin();
			  i != choices.end();
			  ++i )
		{
			gtk_list_store_append(store, &iter);
			gtk_list_store_set(store, &iter,
							   0, (const gchar *)i->utf8_str(),
							   -1);
		}
	 
		GtkEntryCompletion * const completion = gtk_entry_completion_new();
		gtk_entry_completion_set_model(completion, GTK_TREE_MODEL(store));
		gtk_entry_completion_set_text_column(completion, 0);
		gtk_entry_completion_set_minimum_key_length(completion, minimumkey);
		gtk_entry_set_completion(entry, completion);
		g_object_unref(completion);
		return true;
	}
	
include/wx/gtk/textentry.h
	virtual bool DoAutoCompleteStrings(const wxArrayString& choices, int minimumkey = 1);

src/common/arrstr.cpp - line ~253
	if( m_pItems[ui].Find(str) != wxNOT_FOUND )
	
./configure --prefix=/home/you/src/wx291svnrelease --enable-unicode --disable-shared --without-gnomeprint --without-gtkprint
make -j3
make install


3) Download & Install xdotool
http://www.semicomplete.com/projects/xdotool/

make static
mkdir staticlib
cp *.o staticlib
cd staticlib
ar rcs libxdo.a *.o
cp libxdo.a ~/src/kiku/kiku

TEST
./xdotool.static key Shift+Ctrl+n
or any keyboard shortcut that is supposed to do something
if nothing happen, you might need to patch xdotool:
http://groups.google.com/group/xdotool-users/browse_thread/thread/95d36fd1da9b7c14


4) Download & Install Julius
cvs -z3 -d:pserver:[email protected]:/cvsroot/julius co julius4
./configure --prefix=/home/you/src/juliuscvs --with-mictype=alsa --enable-setup=standard --enable-factor2 --enable-wpair --enable-wpair-nlimit --without-sndfile --disable-pthread
make -j3 && make install


5) Download & Install libpd
git clone git://gitorious.org/pdlib/libpd.git
make libs/libpd.so
mkdir staticlib
cp libpd_wrapper/*.o staticlib/
cp pure-data/src/*.o staticlib/
ar rcs libpd.a *.o
cp libpd.a ~/kiku/common
cp ./libpd_wrapper/z_libpd.h ~/kiku/common
cp ./pure-data/src/m_pd.h ~/kiku/common


6) Compile kiku
open project in CodeLite (IDE)
right click on kiku - Settings... - change Compiler & Linker settings (path)
Go to Build - Build and run project - report errors on http://www.workinprogress.ca/kiku/forum/


7) Compile plugins
edit Makefile in ~/src/kiku/plugin/pulseaudio (path)
make

edit Makefile in ~/src/kiku/plugin/pulseaudiomon (path)
make


8) Binary package
~/src/kiku/kiku/make_deb.sh -u
install debian package

If you don't want a package:
sudo mkdir -p /usr/lib/kiku
cp ~/src/kiku/plugin/pulseaudio/adin_pulseaudiolibpd.jpi /usr/lib/kiku
cp ~/src/kiku/plugin/pulseaudiomon/adin_pulseaudiolibpdmon.jpi /usr/lib/kiku
cp ~/src/kiku/plugin/patch/filter/kiku.pd /usr/lib/kiku
i386:
cp ~/src/kiku/plugin/patch/filter/i386/*.pd_linux /usr/lib/kiku
amd64:
cp ~/src/kiku/plugin/patch/filter/amd64/*.pd_linux /usr/lib/kiku

LAUNCH kiku:
~/src/kiku/kiku/Release/kiku


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LINKS
http://julius.sourceforge.jp/en_index.php
http://www.wxwidgets.org/
http://www.codelite.org/
http://gitorious.org/pdlib/pages/Libpd
http://www.semicomplete.com/projects/xdotool/
http://www.voxforge.org/