How to get a list of running programs in Lubuntu 14.04?

It is called "Task Manager" in Lubuntu.

If you want it from commandline: top and htop.

From their wiki:

LXTask is the standard task manager and system monitor of LXDE. It starts via Ctrl+Alt+Del and is extremely lightweight.

To remove an unresponsive application, you may use Term or Kill. It is recommended to first try Term, to see if the application can respond.

Give a try to ps aux or ps -ef commands.

From man ps

To see every process on the system using standard syntax:
      ps -e
      ps -ef
      ps -eF
      ps -ely

To see every process on the system using BSD syntax:
      ps ax
      ps axu

To print a process tree:
      ps -ejH
      ps axjf

To get info about threads:
      ps -eLf
      ps axms

To get security info:
      ps -eo euser,ruser,suser,fuser,f,comm,label
      ps axZ

Use "System Monitor" to view the running processes with GUI, if you don't want to use the "Terminal" typed commands.