Ghostwriter is a Markdown editor with html preview. Previously I used StackEdit, but it’s web-based.
It has built-in US English spellcheck. It supports Hunspell dictionaries for other languages.
To install other languages is easy, for Danish:
$ sudo apt install hunspell-daSubstitute apt with your distro’s package manager. In Ghostwriter, go to Settings > Preferences > Spell Check (tab), and select the desired language. You might need to toggle the spellcheck or switch the language back and forth for it to work.
Here is a list of Hunspell dictionaries in Ubuntu (18.04) repo:
| Package | Language |
|---|---|
| hunspell-af | Afrikaans |
| hunspell-an | Aragonese |
| hunspell-ar | Arabic |
| hunspell-be | Belarusian |
| hunspell-bg | Bulgarian |
| hunspell-bn | Bengali |
| hunspell-bo | Classical Tibetan language |
| hunspell-br | Breton language |
| hunspell-bs | Bosnian |
| hunspell-ca | Catalan |
| hunspell-cs | Czech |
| hunspell-da | Danish |
| hunspell-de-at | Austrian (German) |
| hunspell-de-at-frami | German (Austria) |
| hunspell-de-ch | Swiss (German) |
| hunspell-de-ch-frami | German (Switzerland) |
| hunspell-de-de | German |
| hunspell-de-de-frami | German |
| hunspell-de-med | German medical |
| hunspell-dz | Dzongkha language |
| hunspell-el | Modern Greek |
| hunspell-en-au | English (Australia) |
| hunspell-en-ca | English (Canada) |
| hunspell-en-gb | English (GB) |
| hunspell-en-med | English medical |
| hunspell-en-us | English (US) |
| hunspell-en-za | English (South Africa) |
| hunspell-es | Spanish |
| hunspell-eu | Basque (Euskera) |
| hunspell-fr | French |
| hunspell-fr-classical | French |
| hunspell-fr-comprehensive | French |
| hunspell-fr-modern | French |
| hunspell-fr-revised | French |
| hunspell-gd | Scottish Gaelic |
| hunspell-gl | Galician |
| hunspell-gl-es | Galician |
| hunspell-gu | Gujarati |
| hunspell-gug | Guarani |
| hunspell-he | Hebrew |
| hunspell-hi | Hindi |
| hunspell-hr | Croatian |
| hunspell-hu | Hungarian |
| hunspell-is | Icelandic |
| hunspell-it | Italian |
| hunspell-kk | Kazakh |
| hunspell-kmr | Kurmanji |
| hunspell-ko | Korean |
| hunspell-lo | Laotian |
| hunspell-lt | Lithuanian |
| hunspell-ml | Malayalam |
| hunspell-ne | Nepalese |
| hunspell-nl | Dutch |
| hunspell-no | Norwegian |
| hunspell-oc | Occitan |
| hunspell-pl | Polish |
| hunspell-pt-br | Brazilian Portuguese |
| hunspell-pt-pt | Portuguese |
| hunspell-ro | Romanian |
| hunspell-ru | Russian |
| hunspell-se | North Sámi Hunspell |
| hunspell-si | Sinhala |
| hunspell-sk | Slovak |
| hunspell-sl | Slovene |
| hunspell-sr | Serbian |
| hunspell-sv | Swedish |
| hunspell-sw | Swahili |
| hunspell-te | Telugu |
| hunspell-th | Thai |
| hunspell-uk | Ukrainian |
| hunspell-uz | Uzbek |
| hunspell-vi | Vietnamese |
Edit (06/06/2019): Recently discovered Inkdrop through HN. It’s a note-taking app that supports Markdown and can sync across devices. I think the best feature is its ability to sync the scrolling in editor and HTML output, which is absent in Ghostwriter. I only need a simple editor for my current use case, though I might consider it when I have >50 posts.
Reading through the HN comments, I also discovered Visual Studio Code also supports Markdown and HTML preview. For a Markdown editor, it’s probably overkill though.