diff --git a/meson.build b/meson.build
index 7b941d0..0d6c8ce 100644
--- a/meson.build
+++ b/meson.build
@@ -416,10 +416,13 @@ man_pages = []
 # Tools
 build_tools = get_option('enable-tools') and cc.has_header_symbol('getopt.h', 'getopt_long', prefix: '#define _GNU_SOURCE')
 if build_tools
-    libxkbcommon_tools_internal = static_library(
-        'tools-internal',
+    libxkbcommon_tools_internal_sources = [
         'tools/tools-common.h',
         'tools/tools-common.c',
+    ]
+    libxkbcommon_tools_internal = static_library(
+        'tools-internal',
+        libxkbcommon_tools_internal_sources,
         dependencies: dep_libxkbcommon,
     )
     tools_dep = declare_dependency(
@@ -467,6 +470,15 @@ if build_tools
                    install_dir: dir_libexec)
         configh_data.set10('HAVE_XKBCLI_INTERACTIVE_EVDEV', true)
         install_man('tools/xkbcli-interactive-evdev.1')
+        # The same tool again, but with access to some private APIs.
+        executable('interactive-evdev',
+                'tools/interactive-evdev.c',
+                libxkbcommon_sources,
+                libxkbcommon_tools_internal_sources,
+                dependencies: [tools_dep],
+                c_args: ['-DENABLE_PRIVATE_APIS'],
+                include_directories: [include_directories('src', 'include')],
+                install: false)
     endif
     if get_option('enable-x11')
         x11_tools_dep = declare_dependency(
diff --git a/tools/interactive-evdev.c b/tools/interactive-evdev.c
index 2f03975..8da1056 100644
--- a/tools/interactive-evdev.c
+++ b/tools/interactive-evdev.c
@@ -58,7 +58,12 @@ static int evdev_offset = 8;
 static bool report_state_changes;
 static bool with_compose;
 static enum xkb_consumed_mode consumed_mode = XKB_CONSUMED_MODE_XKB;
+
+#ifdef ENABLE_PRIVATE_APIS
+#define DEFAULT_PRINT_FIELDS (PRINT_ALL_FIELDS & ~PRINT_MODMAPS)
+#else
 #define DEFAULT_PRINT_FIELDS PRINT_ALL_FIELDS
+#endif
 print_state_fields_mask_t print_fields = DEFAULT_PRINT_FIELDS;
 
 #define DEFAULT_INCLUDE_PATH_PLACEHOLDER "__defaults__"
@@ -378,6 +383,9 @@ usage(FILE *fp, char *progname)
         fprintf(fp, "      or: %s --keymap <path to keymap file>\n",
                 progname);
         fprintf(fp, "For both:\n"
+#ifdef ENABLE_PRIVATE_APIS
+                        "          --print-modmaps (print real & virtual key modmaps)\n"
+#endif
                         "          --short (do not print layout nor Unicode keysym translation)\n"
                         "          --report-state-changes (report changes to the state)\n"
                         "          --enable-compose (enable Compose)\n"
@@ -418,6 +426,9 @@ main(int argc, char *argv[])
         OPT_COMPOSE,
         OPT_SHORT,
         OPT_REPORT_STATE,
+#ifdef ENABLE_PRIVATE_APIS
+        OPT_PRINT_MODMAPS,
+#endif
     };
     static struct option opts[] = {
         {"help",                 no_argument,            0, 'h'},
@@ -434,6 +445,9 @@ main(int argc, char *argv[])
         {"short",                no_argument,            0, OPT_SHORT},
         {"report-state-changes", no_argument,            0, OPT_REPORT_STATE},
         {"without-x11-offset",   no_argument,            0, OPT_WITHOUT_X11_OFFSET},
+#ifdef ENABLE_PRIVATE_APIS
+        {"print-modmaps",        no_argument,            0, OPT_PRINT_MODMAPS},
+#endif
         {0, 0, 0, 0},
     };
 
@@ -503,6 +517,11 @@ main(int argc, char *argv[])
                 return EXIT_INVALID_USAGE;
             }
             break;
+#ifdef ENABLE_PRIVATE_APIS
+        case OPT_PRINT_MODMAPS:
+            print_fields |= PRINT_MODMAPS;
+            break;
+#endif
         case 'h':
             usage(stdout, argv[0]);
             return EXIT_SUCCESS;
@@ -584,6 +603,15 @@ main(int argc, char *argv[])
         goto out;
     }
 
+#ifdef ENABLE_PRIVATE_APIS
+    if (print_fields & PRINT_MODMAPS) {
+        print_keys_modmaps(keymap);
+        putchar('\n');
+        print_keymap_modmaps(keymap);
+        putchar('\n');
+    }
+#endif
+
     act.sa_handler = sigintr_handler;
     sigemptyset(&act.sa_mask);
     act.sa_flags = 0;
diff --git a/tools/tools-common.c b/tools/tools-common.c
index 3262f61..d48f74a 100644
--- a/tools/tools-common.c
+++ b/tools/tools-common.c
@@ -61,6 +61,87 @@ print_keycode(struct xkb_keymap *keymap, const char* prefix,
     }
 }
 
+#ifdef ENABLE_PRIVATE_APIS
+#include "src/keymap.h"
+
+void
+print_keymap_modmaps(struct xkb_keymap *keymap) {
+    printf("Modifiers mapping:\n");
+    for (xkb_mod_index_t vmod = 0; vmod < xkb_keymap_num_mods(keymap); vmod++) {
+        if (keymap->mods.mods[vmod].type & MOD_REAL)
+            continue;
+        printf("- %s: ", xkb_keymap_mod_get_name(keymap, vmod));
+        if (keymap->mods.mods[vmod].mapping) {
+            bool first = true;
+            for (xkb_mod_index_t mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
+                if (keymap->mods.mods[vmod].mapping & (1u << mod)) {
+                    if (first) {
+                        first = false;
+                        printf("%s", xkb_keymap_mod_get_name(keymap, mod));
+                    } else {
+                        printf("+ %s", xkb_keymap_mod_get_name(keymap, mod));
+                    }
+                }
+            }
+        } else {
+            printf("(unmapped)");
+        }
+        printf("\n");
+    }
+}
+
+#define MODMAP_PADDING  7
+#define VMODMAP_PADDING 9
+static void
+print_key_modmaps(struct xkb_keymap *keymap, xkb_keycode_t keycode) {
+    const struct xkb_key *key = XkbKey(keymap, keycode);
+    if (key != NULL) {
+        xkb_mod_index_t mod;
+
+        printf("modmap [ ");
+        if (key->modmap) {
+            for (mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
+                if (key->modmap & (1u << mod)) {
+                    printf("%-*s", (int) MODMAP_PADDING,
+                           xkb_keymap_mod_get_name(keymap, mod));
+                    break;
+                }
+            }
+        } else {
+            printf("%*c", (int) MODMAP_PADDING, ' ');
+        }
+
+        printf(" ] vmodmap [ ");
+        int length = 0;
+        const char *mod_name;
+        for (mod = 0; mod < xkb_keymap_num_mods(keymap); mod++) {
+            if (key->vmodmap & (1u << mod)) {
+                mod_name = xkb_keymap_mod_get_name(keymap, mod);
+                length += strlen(mod_name) + 1;
+                printf("%s ", mod_name);
+            }
+        }
+        if (length < VMODMAP_PADDING) {
+            printf("%*c", (int) VMODMAP_PADDING - length, ' ');
+        }
+        printf("] ");
+    }
+}
+
+void
+print_keys_modmaps(struct xkb_keymap *keymap) {
+    const struct xkb_key *key;
+    printf("Keys modmaps:\n");
+    xkb_keys_foreach(key, keymap) {
+        if (key->modmap || key->vmodmap) {
+            print_keycode(keymap, "- ", key->keycode, ": ");
+            print_key_modmaps(keymap, key->keycode);
+            putchar('\n');
+        }
+    }
+}
+#endif
+
 void
 tools_print_keycode_state(struct xkb_state *state,
                           struct xkb_compose_state *compose_state,
@@ -103,6 +184,12 @@ tools_print_keycode_state(struct xkb_state *state,
 
     print_keycode(keymap, "keycode [ ", keycode, " ] ");
 
+#ifdef ENABLE_PRIVATE_APIS
+    if (fields & PRINT_MODMAPS) {
+        print_key_modmaps(keymap, keycode);
+    }
+#endif
+
     printf("keysyms [ ");
     for (int i = 0; i < nsyms; i++) {
         xkb_keysym_get_name(syms[i], s, sizeof(s));
diff --git a/tools/tools-common.h b/tools/tools-common.h
index 21ba848..cc7771b 100644
--- a/tools/tools-common.h
+++ b/tools/tools-common.h
@@ -38,6 +38,9 @@
 
 /* Fields that are printed in the interactive tools. */
 enum print_state_fields {
+#ifdef ENABLE_PRIVATE_APIS
+    PRINT_MODMAPS = (1u << 1),
+#endif
     PRINT_LAYOUT = (1u << 2),
     PRINT_UNICODE = (1u << 3),
     PRINT_ALL_FIELDS = ((PRINT_UNICODE << 1) - 1),
@@ -50,6 +53,13 @@ enum print_state_fields {
 };
 typedef uint32_t print_state_fields_mask_t;
 
+#ifdef ENABLE_PRIVATE_APIS
+void
+print_keymap_modmaps(struct xkb_keymap *keymap);
+void
+print_keys_modmaps(struct xkb_keymap *keymap);
+#endif
+
 void
 tools_print_keycode_state(struct xkb_state *state,
                           struct xkb_compose_state *compose_state,