diff --git a/lua/znvim/plugins/init.lua b/lua/znvim/plugins/init.lua
index a564707..2e6a2de 100644
--- a/lua/znvim/plugins/init.lua
+++ b/lua/znvim/plugins/init.lua
@@ -1 +1,133 @@
-return {}
+return {
+    { -- display undo tree for a file
+        "https://github.com/mbbill/undotree",
+        cmd = "UndotreeToggle",
+        keys = {
+            { "<leader>ut", "<cmd>UndotreeToggle<cr>",    desc = "undo tree" },
+        },
+    },
+    { -- markview.nvim
+        "https://github.com/OXY2DEV/markview.nvim",
+        ft = 'markdown',
+        keys = {
+            { -- toggle markview rendering
+                "<localleader>t",
+                "<cmd>Markview toggle<cr>",
+                desc = "Toggle markdown rendering",
+                ft = "markdown"
+            },
+        },
+        opts = {
+            modes = { "n", "i", "no", "c" },
+            hybrid_modes = { "i" },
+            callbacks = {
+                on_enable = function (_, win)
+                    vim.wo[win].conceallevel = 2;
+                    vim.wo[win].concealcursor = "nc";
+                end
+            }
+        },
+    },
+    { -- repl integration
+        "https://github.com/Vigemus/iron.nvim",
+        keys = {
+            { "<leader>rs", "<cmd>IronRepl<cr>", desc = "Show/start REPL" },
+            { "<leader>rh", "<cmd>IronHide<cr>", desc = "Hide REPL" },
+            { "<leader>rf", "<cmd>IronFocus<cr>", desc = "Focus REPL" },
+            { "<leader>rr", "<cmd>IronRestart<cr>", desc = "Restart REPL" },
+            { "<leader>rq", function() require("iron").core.close_repl(vim.bo.filetype) end, desc = "Quit REPL" },
+        },
+        opts = {
+            config = {
+                -- Whether a repl should be discarded or not
+                scratch_repl = true,
+                -- Your repl definitions come here
+                repl_definition = {
+                    sh = {
+                        -- Can be a table or a function that
+                        -- returns a table (see below)
+                        command = {"zsh"}
+                    },
+                    julia = {
+                        command = {"julia", "--project", "--threads", "4"},
+                    },
+                },
+                repl_open_cmd = "vertical botright 80 split", -- require("iron").view.split.vertical.botright(100),
+            },
+            -- Iron doesn't set keymaps by default anymore.
+            -- You can set them here or manually add keymaps to the functions in iron.core
+            keymaps = {
+                send_motion = "<leader>ss",
+                visual_send = "<leader>ss",
+                send_file = "<space>sf",
+                send_line = "<space>sl",
+                send_until_cursor = "<space>su",
+                -- send_mark = "<space>sm",
+                mark_motion = "<space>mc",
+                mark_visual = "<space>mc",
+                remove_mark = "<space>md",
+                cr = "<space>s<cr>",
+                interrupt = "<space>s<space>",
+                clear = "<space>cl",
+            },
+            -- If the highlight is on, you can change how it looks
+            -- For the available options, check nvim_set_hl
+            highlight = {
+                italic = false,
+            },
+            ignore_blank_lines = true, -- ignore blank lines when sending visual select lines
+        },
+        config = function (_, opts)
+            local iron = require("iron.core")
+            iron.setup(opts)
+
+            IronSendCell = function(next_cell)
+                -- source: https://github.com/Vigemus/iron.nvim/issues/236#issuecomment-1317674256
+                local iron_core = require('iron.core')
+                local marks = require('iron.marks')
+
+                local cell_pattern = "^\\s*##"  -- cell delimiter pattern
+                local cell_start = vim.fn.search(cell_pattern, 'bcnW')
+                local cell_end = vim.fn.search(cell_pattern, 'nW')
+
+                local lines = vim.api.nvim_buf_get_lines(0, cell_start, cell_end-1, 0)
+                -- ignore blank lines
+                local b_lines = {}
+                for _, line in ipairs(lines) do
+                    if line:gsub("^%s*(.-)%s*$", "%1") ~= '' then
+                        table.insert(b_lines, line)
+                    end
+                end
+                if #b_lines == 0 then return end
+
+                if cell_start == 0 then
+                    cell_start = 1 -- if first cell, then start from first line
+                end
+                if cell_end == 0 then
+                    cell_end = vim.fn.line('$') -- set to last line
+                end
+
+                marks.set{ from_line=cell_start, from_col=0, to_line=cell_end, to_col=-1 }
+                marks.winrestview()
+
+                iron_core.send(nil, b_lines)
+                if next_cell == true then
+                    vim.fn.cursor(cell_end+1, 0) -- move to next cell start
+                end
+            end
+
+            vim.keymap.set('n', '<space>sc', function () IronSendCell(false) end)
+            vim.keymap.set('n', '<space>sC', function () IronSendCell(true) end)
+            vim.cmd("nmap <leader>sp <leader>ssap")
+        end
+    },
+    { -- neodev
+        "https://github.com/folke/lazydev.nvim",
+        ft = "lua",
+    },
+    { -- A better user experience for interacting with and manipulating marks
+        "https://github.com/chentoast/marks.nvim",
+        event = "BufReadPost",
+        config = true,
+    },
+}
diff --git a/lua/znvim/plugins/lsp.lua b/lua/znvim/plugins/lsp.lua
index dc74a3d..d91ba6b 100644
--- a/lua/znvim/plugins/lsp.lua
+++ b/lua/znvim/plugins/lsp.lua
@@ -157,7 +157,7 @@ return {
                 -- "neocmake",
                 "dockerls",
                 "elixirls",
-                "fennel_ls",
+                -- "fennel_ls",
                 "fortls",
                 "html",
                 "biome", -- js + json