There is a set I installed on mine (every time I wiped them) that I use all the time. But it really depends on what you want to do with it. I have a 1GB swap file on the SD card, and I have the OS copied and booting from the SD card as well. I connect via samba and ftp and mess with php, python and the oled and gps extensions.
htop (from LEDE repository)
samba36-server (from LEDE repository)