My snippet files for Ultisnips: https://github.com/SirVer/ultisnips

markdown.snippets

snippet kbd "HTML kbd tag"
<kbd>${1:KEY}</kbd>$0
endsnippet

snippet head "Markdown header" b
---
title: "$1"
date: `!v strftime("%Y-%m-%d %H:%M:%S%z")`
tags: [$2]
categories: [$3]
---
$0
endsnippet

snippet more "HTML more tag"
<!--more-->
endsnippet

snippet img "aligned image using HTML tag"
<p align="center">
<img src="${1:URL}">
</p>
$0
endsnippet

python.snippets

snippet head "Python source file header" b
"""
Description: $1
Author: Jie-dong Hao
Date: `!v strftime("%Y-%m-%d %H:%M:%S%z")`
Update: `!v strftime("%Y-%m-%d %H:%M:%S%z")`
"""
$0
endsnippet

snippet print "Print value of some variable"
print("$1".format($2))
$0
endsnippet

snippet impa "import FOO as BAR" b
import ${1:FOO} as ${2:BAR}
endsnippet

tex.snippets

snippet frac "Math fractions"
\frac{${1:NUM}}{${2:DEN}} $0
endsnippet