Abhinavagupta (Aachaarya) on the Geetaa.
700 verses.

Sri Aurobindo's Bhagavad Geetaa in one paraphrased file online - good
http://intyoga.online.fr/bg_idx.htm

Bal Gangadhar Tilak

Gandhiji's commentary on the Bhagavad Gieetaa --
http://home.comcast.net/~surfings/GandhiGita/GandhiFrame.htm

Keshav Kashmiri Bhattacharya Gita - printed in Vrindavan about 100 years ago
700 verses.

Raamaanuj Bhaashya (Gita Press)
700 verses.

Shankar Bhaashya (Gita Press)
700 verses.

Shankaraanandeeya Bhaashya (Achyuta Granthamala, Varanasi) editions.
700 verses.

Most common commentaries are by
Abhinavgupta,  Baladeva,  Madhavacharya,  Madhusudan Saraswati,  Ramanujacharya,  Shankaracharya,  Sridharacharya,  Vishwanath.
Some of them are vailable in gretil - http://fiindolo.sub.uni-goettingen.de/gret_utf.htm#GrhyaS

A Special Commentary on Geetaa
An edition of the Bhagvad Geetaa with 11 Sanskrit commentaries, published by the Gujarati Printing Press, Bombay in 1935.
This book contains an advertisement for the Mahabharata Viraat Parv with 8 Teekaa and Udyog Parv with 5 Teekaa. Translated from Sanskrit and reproduced below is the text of the advertisement.

Mahaabhaarat
Sri Mahabharata Viraat Parv with the following 8 Teekaa --
1. Bharata-bhava-deep by Nilakantha
2. Deepika by Arjuna Mishra
3. Prakasha by Chaturbhuja Mishra
4. Bharatartha-prakasha by Sarvajnanarayana
5. Durghatartha-prakashini by Vimalabodha
6. Virodhartha-manjari by Ramakrishna
7. Vishama-pada-vivaranam [A discussion/analysis of difficult words]
8. Lakshabharanam by Vadeerajateertha

Sri Mahabharata Udyog Parv with the following 5 Teekaa --
1. Bhava-deepa of Nilakantha
2. Deepika by Arjuna Mishra
3. Durghatartha-prakashini by Vimalabodha
4. Bharatartha-prakasha by Sarvajnanarayana
5. Lakshabharanam by Vadeerajateertha