return {
    -- Mason for managing external tools (LSP servers, linters, etc.)
    {
        "williamboman/mason.nvim",
        version = "=1.0.1",
        config = function()
            require("mason").setup()
        end
    },
    -- Mason LSP config to bridge Mason and nvim-lspconfig
    {
        "williamboman/mason-lspconfig.nvim",
        version = "=1.0.1",
        config = function()
            require("mason-lspconfig").setup {
                ensure_installed = {"pyright"},
                automatic_installation = false, -- Set to true to automatically install servers
            }
        end
    },
    -- nvim-lspconfig for configuring LSP servers
    {
        "neovim/nvim-lspconfig",
        config = function()
            local lspconfig = require("lspconfig")
            local capabilities = require('cmp_nvim_lsp').default_capabilities()

            -- Setup LSP server (Pyright for Python)
            lspconfig.pyright.setup {
                capabilities = capabilities,
                on_attach = function(client, bufnr)
                    local buf_set_keymap = vim.api.nvim_buf_set_keymap
                    local buf_set_option = vim.api.nvim_buf_set_option

                    buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

                    -- Key mappings for LSP
                    local opts = { noremap = true, silent = true }
                    buf_set_keymap(bufnr, 'n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', 'K', '<Cmd>lua vim.lsp.buf.hover()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<leader>so', [[<cmd>lua require('telescope.builtin').lsp_document_symbols()<CR>]], opts)
                    vim.cmd [[ command! Format execute 'lua vim.lsp.buf.formatting()' ]]

                    -- Scroll hover documentation
                    buf_set_keymap(bufnr, 'n', '<C-f>', '<cmd>lua vim.lsp.util.scroll_popup(1)<CR>', opts)
                    buf_set_keymap(bufnr, 'n', '<C-b>', '<cmd>lua vim.lsp.util.scroll_popup(-1)<CR>', opts)
                end,
            }
        end
    },
    -- nvim-cmp for autocompletion
    {
        "hrsh7th/nvim-cmp",
        dependencies = {
            "SirVer/ultisnips",
            "hrsh7th/cmp-nvim-lsp",
            "hrsh7th/cmp-buffer",
            "hrsh7th/cmp-path",
            "hrsh7th/cmp-cmdline",
            "quangnguyen30192/cmp-nvim-ultisnips",
            -- "nvim-treesitter/nvim-treesitter", -- Ensure this for better syntax highlighting
            "onsails/lspkind-nvim",
            "hrsh7th/cmp-nvim-lsp-signature-help",
            "R-nvim/cmp-r"
        },
        config = function()
            local cmp = require'cmp'
            local lspkind = require('lspkind')
            
            cmp.setup({
                snippet = {
                    expand = function(args)
                        vim.fn["UltiSnips#Anon"](args.body)
                    end,
                },
                mapping = {
                    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
                    ['<C-f>'] = cmp.mapping.scroll_docs(4),
                    ['<C-Space>'] = cmp.mapping.complete(),
                    ['<C-e>'] = cmp.mapping.abort(),
                    ['<CR>'] = cmp.mapping.confirm({ select = true }),
                    ['<Tab>'] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_next_item()
                        elseif vim.fn["UltiSnips#CanExpandSnippet"]() == 1 then
                            vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<C-R>=UltiSnips#ExpandSnippet()<CR>", true, true, true), "")
                        elseif vim.fn["UltiSnips#CanJumpForwards"]() == 1 then
                            vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<C-R>=UltiSnips#JumpForwards()<CR>", true, true, true), "")
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                    ['<S-Tab>'] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_prev_item()
                        elseif vim.fn["UltiSnips#CanJumpBackwards"]() == 1 then
                            vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<C-R>=UltiSnips#JumpBackwards()<CR>", true, true, true), "")
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                },
                sources = cmp.config.sources({
                    { name = 'nvim_lsp' },
                    { name = 'nvim_lsp_signature_help' },
                    { name = 'ultisnips' },
                    { name = "cmp_r" }
                }, {
                    { name = 'buffer' },
                }),
                formatting = {
                    format = lspkind.cmp_format({ with_text = true, maxwidth = 50 })
                }
            })
--
-- --            Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
--             cmp.setup.cmdline('/', {
--                 sources = {
--                     { name = 'buffer' }
--                 }
--             })
--
--             cmp.setup.cmdline('?', {
--                 sources = {
--                     { name = 'buffer' }
--                 }
--             })
--
--             -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
--             cmp.setup.cmdline(':', {
--                 sources = cmp.config.sources({
--                     { name = 'path' }
--                 }, {
--                     { name = 'cmdline' }
--                 })
--             })
            require("cmp_r").setup({ })
         end
     }
}