My own variation of the Canadian Multilingual Standard keymap. All AltGr combinations are on the right-hand side; modifiers are swapped around to fit various machines and keyboards that I have.

ca_rz.xkbmap

default partial
xkb_symbols "basic" {
    name[Group1] = "Canada (RZ)";

    key <TLDE>	{ [    egrave,     Egrave,      degree ]	};
    key <AE01>	{ [         1,     exclam ]	};
    key <AE02>	{ [         2,         at ]	};
    key <AE03>	{ [         3, numbersign ]	};
    key <AE04>	{ [         4,     dollar ]	};
    key <AE05>	{ [         5,    percent ]	};
    key <AE06>	{ [         6,   question ]	};
    key <AE07>	{ [         7,  ampersand,     braceleft ]	};
    key <AE08>	{ [         8,   asterisk,    braceright ]	};
    key <AE09>	{ [         9,  parenleft,   bracketleft ]	};
    key <AE10>	{ [         0, parenright,  bracketright ]	};
    key <AE11>	{ [     minus, underscore ]	};
    key <AE12>	{ [     equal,       plus ]	};

    key <AD01>	{ [         q,          Q ]	};
    key <AD02>	{ [         w,          W ]	};
    key <AD03>	{ [         e,          E ]	};
    key <AD04>	{ [         r,          R ]	};
    key <AD05>	{ [         t,          T ]	};
    key <AD06>	{ [         y,          Y ]	};
    key <AD07>	{ [         u,          U,      ugrave,      Ugrave ]	};
    key <AD08>	{ [         i,          I,     section ]	};
    key <AD09>	{ [         o,          O,          oe,          OE ]	};
    key <AD10>	{ [         p,          P,   paragraph ]	};
    key <AD11>	{ [dead_circumflex, dead_diaeresis, grave, dead_grave]	};
    key <AD12>	{ [  ccedilla,   Ccedilla,  asciitilde ]	};

    key <AC01>	{ [         a,          A ]	};
    key <AC02>	{ [         s,          S ]	};
    key <AC03>	{ [         d,          D ]	};
    key <AC04>	{ [         f,          F ]	};
    key <AC05>	{ [         g,          G ]	};
    key <AC06>	{ [         h,          H ]	};
    key <AC07>	{ [         j,          J ]	};
    key <AC08>	{ [         k,          K,  guillemotleft ]	};
    key <AC09>	{ [         l,          L, guillemotright ]	};
    key <AC10>	{ [ semicolon,      colon,         bar ]	};
    key <AC11>	{ [    egrave,     Egrave,      degree ]	};
    key <BKSL>	{ [    agrave,     Agrave,      aring,       Aring ]	};

    key <LSGT>	{ [     slash,  backslash ]	};
    key <AB01>	{ [         z,          Z ]	};
    key <AB02>	{ [         x,          X ]	};
    key <AB03>	{ [         c,          C ]	};
    key <AB04>	{ [         v,          V ]	};
    key <AB05>	{ [         b,          B ]	};
    key <AB06>	{ [         n,          N ]	};
    key <AB07>	{ [         m,          M,    backslash,         mu ]	};
    key <AB08>	{ [     comma, apostrophe,         less ]	};
    key <AB09>	{ [    period,   quotedbl,      greater ]	};
    key <AB10>	{ [    eacute,     Eacute,        slash, dead_acute ]	};

    key <SPCE>	{ [     space,      space, nobreakspace ]	};
};

partial
xkb_symbols "cherry_common" {
    key <AC11>  {
	type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ Control_R ]
    };
    key <LCTL>	{
	type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ VoidSymbol ]
    };
    key <RCTL>	{
	type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    egrave,     Egrave,      degree ]
    };
    key <DELE>	{
	type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    egrave,     Egrave,      degree ]
    };
    key <LWIN>  { symbols[Group1] = [ Alt_L ] };
    key <RWIN>  { symbols[Group1] = [ Alt_L ] };
    key <LALT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <LSGT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <MENU>  { symbols[Group1] = [ Super_L ] };
    key <INS>  	{ symbols[Group1] = [ Super_L ] };
    modifier_map Control { <AC11>, <CAPS> };
    modifier_map Mod1 { <LWIN>, <RWIN>, <RALT> };
    modifier_map Mod4 { <MENU> };
    modifier_map Mod5 { ISO_Level3_Shift };
    modifier_map Mod5 { <LALT>, <LSGT> };
};

partial
xkb_symbols "cherry" {
    include "ca_rz(basic)"
    include "ctrl(swapcaps)"
    include "ca_rz(cherry_common)"
};

partial
xkb_symbols "cherry_onetbsd" {
    include "pc/ca_rz(basic)"
    include "ctrl(swapcaps)"
    include "pc/ca_rz(cherry_common)"
};

partial
xkb_symbols "inspiron_common" {
    key <AC11>  {
	type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ Control_R ]
    };
    key <MENU>	{
	type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    egrave,     Egrave,      degree ]
    };
    key <INS>	{
	type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    egrave,     Egrave,      degree ]
    };
    key <DELE>	{
        type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    agrave,     Agrave,      aring,       Aring ]
    };
    key <LWIN>  { symbols[Group1] = [ Alt_L ] };
    key <RWIN>  { symbols[Group1] = [ Alt_L ] };
    key <LALT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <LSGT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <RCTL>  {
        type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ Super_L ]
    };
    modifier_map Control { <AC11>, <CAPS> };
    modifier_map Mod1 { <LWIN>, <RWIN>, <RALT> };
    modifier_map Mod4 { <MENU> };
    modifier_map Mod5 { ISO_Level3_Shift };
    modifier_map Mod5 { <LALT>, <LSGT> };
};

partial
xkb_symbols "inspiron" {
    include "ca_rz(basic)"
    include "ctrl(swapcaps)"
    include "ca_rz(inspiron_common)"
};

partial
xkb_symbols "inspiron_onetbsd" {
    include "pc/ca_rz(basic)"
    include "ctrl(swapcaps)"
    include "pc/ca_rz(inspiron_common)"
};

partial
xkb_symbols "hpmini_common" {
    key <CAPS>  {
	type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ Control_L ]
    };
    key <AC11>  {
	type[Group1] = "ONE_LEVEL",
	symbols[Group1] = [ Control_R ]
    };
    key <RCTL>	{
	type[Group1] = "FOUR_LEVEL",
	symbols[Group1] = [    egrave,     Egrave,      degree ]
    };
    key <LWIN>  { symbols[Group1] = [ Alt_L ] };
    key <RALT>  { symbols[Group1] = [ Alt_L ] };
    key <LALT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <LSGT>  {
        type[Group1] = "ONE_LEVEL",
        symbols[Group1] = [ ISO_Level3_Shift ]
    };
    key <MENU>  { symbols[Group1] = [ Super_L ] };
    key <LCTL>  { symbols[Group1] = [ Menu ] };
    modifier_map Control { <AC11>, <CAPS> };
    modifier_map Mod1 { <LWIN>, <RALT> };
    modifier_map Mod4 { <MENU> };
    modifier_map Mod5 { ISO_Level3_Shift };
    modifier_map Mod5 { <LALT>, <LSGT> };
};

partial
xkb_symbols "hpmini_linux" {
    include "ca_rz(basic)"
    include "ca_rz(hpmini_common)"
};