A Photoshop Script that add selected layers and groups even spacing which you inputted.

AddEvenSpacingAlign.jsx

#target photoshop
app.bringToFront();

(function(global) {

  if (!documents.length) return;

  function getSelectedLayers() {
    var layers, gL, desc11, ref9, ref10;
    layers = [];
    desc11 = new ActionDescriptor();
    ref9 = new ActionReference();
    ref10 = new ActionReference();
    ref9.putClass(stringIDToTypeID('layerSection'));
    desc11.putReference(charIDToTypeID('null'), ref9);
    ref10.putEnumerated(charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt'));
    desc11.putReference(charIDToTypeID('From'), ref10);
    executeAction(charIDToTypeID('Mk  '), desc11, DialogModes.NO);
    gL = activeDocument.activeLayer.layers;
    for (var i = 0; i < gL.length; i++) {
      layers.push(gL[i]);
    }
    undo();
    return layers;
  }
  
  function undo() {
    executeAction(charIDToTypeID('undo'), undefined, DialogModes.NO);
  }

  function unitBounds(a, b) {
    return [
      a[0] < b[0] ? a[0] : b[0],
      a[1] < b[1] ? a[1] : b[1],
      a[2] > b[2] ? a[2] : b[2],
      a[3] > b[3] ? a[3] : b[3]
    ];
  }

  // since bounds of the Vector layer is strange :(
  function getBounds(layer) {
    var bounds;
    switch(layer.typename) {
      case "ArtLayer":
        layer.rasterize(RasterizeType.ENTIRELAYER);
        bounds = layer.bounds;
        undo();
      break;
      case "LayerSet":
        bounds = getBounds(layer.layers[0]);
        for(var i = 1, iz = layer.layers.length; i < iz; i++) {
          bounds = unitBounds(bounds, getBounds(layer.layers[i]));
        }
      break;
      default:
        bounds = layer.bounds;
      break;
    }
    return bounds;
  }

  function LayerObject(layer) {
    this.layer = layer;
    this.bounds = getBounds(layer);
    this.left = parseInt(this.bounds[0]);
    this.top = parseInt(this.bounds[1]);
    this.right = parseInt(this.bounds[2]);
    this.bottom = parseInt(this.bounds[3]);
    this.width = this.right - this.left;
    this.height = this.bottom - this.top;
    this.translate = function() {
      layer.translate.apply(layer, arguments);
    };
  }

  function align(gap) {
    var layers = getSelectedLayers(),
        rasterizedLayerset,
        startPoint,
        firstLayer;
    if (layers.length <= 1) return false;

    firstLayer = new LayerObject(layers[0]);
    startPoint = {
      x: firstLayer.right + gap.x,
      y: firstLayer.bottom + gap.y
    };
    for (var i = 1, iz = layers.length; i < iz; i++) {
      var layer = new LayerObject(layers[i]),
          distance = {
            x: gap.x === false ? 0 : startPoint.x - layer.left,
            y: gap.y === false ? 0 : startPoint.y - layer.top
          };
      layer.translate(distance.x, distance.y);
      if (gap.x !== false) {
        startPoint.x += layer.width + gap.x;
      }
      if (gap.y !== false) {
        startPoint.y += layer.height + gap.y;
      }
    }
  }

  var isApplied = false,
      savedState = activeDocument.activeHistoryState;

  // Create UI
  var win = new Window("dialog", "Add even spacing align", [600, 400, 900, 640]);

  win.checkBox_hr = win.add("checkbox", [10, 10, 200, 35], " Horizontal align");
  win.checkBox_vr = win.add("checkbox", [10, 105, 200, 130], " Vertical align");

  win.staticText_hr = win.add("statictext", [30, 44, 85, 65], "Spacing:")
  win.staticText_vr = win.add("statictext", [30, 139, 85, 160], "Spacing:")

  win.editText_hr = win.add("edittext", [90, 40, 190, 65]);
  win.editText_vr = win.add("edittext", [90, 135, 190, 160]);

  win.slider_hr = win.add("slider", [30, 70, 290, 80], 0, -300, 300);
  win.slider_vr = win.add("slider", [30, 165, 290, 175], 0, -300, 300);

  win.btn_ok = win.add("button", [10, 205, 85, 230], "OK", { name: "ok" });
  win.btn_ap = win.add("button", [90, 205, 165, 230], "Apply");
  win.btn_cn = win.add("button", [215, 205, 290, 230], "Cancel", { name: "cancel" });

  // Add Event
  win.editText_hr.onChanging = function() {
    isApplied = false;
    win.checkBox_hr.value = true;
    win.slider_hr.value = parseInt(win.editText_hr.text) || 0;
  };

  win.slider_hr.onChanging = function() {
    isApplied = false;
    win.checkBox_hr.value = true;
    win.editText_hr.text = parseInt(win.slider_hr.value);
  };

  win.editText_vr.onChanging = function() {
    isApplied = false;
    win.checkBox_vr.value = true;
    win.slider_vr.value = parseInt(win.editText_vr.text) || 0;
  };

  win.slider_vr.onChanging = function() {
    isApplied = false;
    win.checkBox_vr.value = true;
    win.editText_vr.text = parseInt(win.slider_vr.value);
  };

  function apply_align() {
    var gap;
    if (isApplied) return;
    gap = {
      x: win.checkBox_hr.value,
      y: win.checkBox_vr.value
    };
    if (gap.x) {
      gap.x = parseInt(win.editText_hr.text) || 0;
    }
    if (gap.y) {
      gap.y = parseInt(win.editText_vr.text) || 0;
    }
    activeDocument.suspendHistory("Add even spacing align", "align(gap)");
    isApplied = true;
    refresh();
  }

  win.btn_ap.onClick = apply_align;

  win.btn_ok.onClick = function() {
    apply_align();
    win.close();
  };

  win.btn_cn.onClick = function() {
    activeDocument.activeHistoryState = savedState;
    win.close();
  }

  // Show
  win.show();

})(this);