A not exhaustive list of software suitable for variable stars (e.g. reduction of images, photometry, period search, etc.).
1. IRIS
2. Period04
3. IRAF
4. AIP4WIN
5. Mira
6. MPO Canopus
7. MaxIm DL
8. Peranso
10. VStar on CitizenSky.org, AAVSO, or Sourceforge
11. AVE
[added on 10/3/2011]
12. AstroImageJ
[added on 23/11/2015]
13. Aperture Photometry Tool
[added on 15/4/2016]
14 VaST (Variability Search Toolkit)
[added on 5/8/2020]