A gimp plugin that allows you to create a rotating gif from your selected layer.

gimp_gif_rotate.py

#!/usr/bin/env python

from gimpfu import *
import math


def python_gif_rotate(image, base_layer, rotation=360, amount=60, time=1000, clockwise=True,
                      center_auto=True, center_x=0, center_y=0, auto_resize=True):
    step_rot = rotation / amount
    if not clockwise:
        step_rot = -step_rot

    time_per_frame = time / amount

    suffix = " (%sms) (replace)" % time_per_frame

    for step in range(1, amount):
        next_layer = base_layer.copy()
        image.add_layer(next_layer, 0)
        pdb.gimp_item_transform_rotate(next_layer, math.radians(step_rot * step),
                                       center_auto, center_x, center_y)
        next_layer.name += " (step %s)%s" % (step, suffix)
        if auto_resize:
            pdb.gimp_layer_resize_to_image_size(next_layer)

    base_layer.name += suffix


register(
    "python_fu_gif_rotate",
    "Used to make a gif that rotate by a defined amount of percent step by step.",
    "Used to make a gif that rotate by a defined amount of percent step by step.",
    "Jesus_Crie",
    "Jesus_Crie",
    "2018",
    "<Image>/Filters/Animation/Rotate Image...",
    "*",
    [
        (PF_INT, "rotation", "Full rotation (degrees)", 360),
        (PF_INT, "amount", "Amount of images to generate (some sort of FPS)", 60),
        (PF_INT, "time", "Amount of time for the rotation (ms)", 1000),
        (PF_BOOL, "clockwise", "Rotate clockwise ?", True),
        (PF_BOOL, "center_auto", "Automatically set the center (center of selection)", True),
        (PF_INT, "center_x", "Manual center of rotation (x)", 0),
        (PF_INT, "center_y", "Manual center of rotation (y)", 0),
        (PF_BOOL, "auto_resize", "Automatically resize the created layers to image size", True)
    ],
    [],
    python_gif_rotate)

main()

gimp_slice_and_save.py

#!/usr/bin/env python

from gimpfu import *


def python_slice_n_save(image, layer, horizontal=2, vertical=2, name='', file='', auto_convert=True):
    if not len(name) == 0:
        pdb.gimp_image_set_filename(image, name + '.gif')

    if not file.endswith('/'):
        file += '/'

    # Convert to indexed colors
    if pdb.gimp_drawable_is_indexed(layer) == 0:
        if auto_convert:
            pdb.gimp_image_convert_indexed(image, 0, 0, 255, 0, 1, '')
        else:
            pdb.gimp_message('WARNING: You need to convert your image to indexed colors mode.')
            return

    # Delete other guides
    last_id = pdb.gimp_image_find_next_guide(image, 0)
    while not last_id == 0:
        pdb.gimp_image_delete_guide(image, last_id)
        last_id = pdb.gimp_image_find_next_guide(image, 0)

    h_slices = 100 / horizontal
    for i in range(1, horizontal):
        percent = h_slices * i
        pdb.script_fu_guide_new_percent(image, layer, 1, percent)

    v_slices = 100 / vertical
    for i in range(1, vertical):
        percent = v_slices * i
        pdb.script_fu_guide_new_percent(image, layer, 0, percent)

    count, ids = pdb.plug_in_guillotine(image, layer)
    output_images = [img for img in gimp.image_list() if img.ID in ids]

    for image in output_images:
        print(file + image.name)
        pdb.file_gif_save(image, layer, file + image.name, file + image.name,
                          0, 1, 100, 2)

    for image in output_images:
        pdb.gimp_image_delete(image)


register(
    'python_fu_slice_and_save',
    'Used to slice the image in a number of pieces and export them.',
    'Used to slice the image in a number of pieces and export them.',
    'Jesus_Crie',
    'Jesus_Crie',
    '2018',
    '<Image>/Image/Transform/Slice \'n save...',
    '*',
    [
        (PF_INT, 'horizontal', 'Horizontal slices', 2),
        (PF_INT, 'vertical', 'Vertical slices', 2),
        (PF_STRING, 'name', 'Basename of the exported files', ''),
        (PF_DIRNAME, 'file', 'Output directory', ''),
        (PF_BOOL, 'auto_convert', 'Automatically convert image to indexed colors mode (if necessary)', True)
    ],
    [],
    python_slice_n_save
)

main()