The Catalan movement has not limited itself to peaceful means, but you are absolutely correct in saying that the high-profile status of ETA is unique among the independence movement for both countries, at least internationally.

For context, ETA was active from 1959 through... well, to avoid falling afoul of the 20 year rule, I'll mention the 2006 ceasefire, and simply acknowledge here that the stoppage didn't hold and ETA would remain semi-active through 2010. Most of my statistics for the group start in 1968. The Spanish Interior Ministry puts the death toll for ETA at 829, which is a staggering and sobering number, more comparable to the violence perpetrated in Northern Ireland than to that committed by the German Red Army Faction or the American Weatherman Organization.

I bring those comparisons up because the militant groups in Catalonia during the time period were far less devastating, at least in terms of loss of life. There were several splintered militant groups fighting for Catalan independence, a few of whom trained with ETA. In fact, one former Catalan fighter was killed by Spanish police during a raid on an ETA safehouse in 1991.

The most famous of these groups are Terra Lliure and the ERCA (Catalan Red Liberation Army). The former group is responsible for five deaths, of which four were members killed in premature/botched explosions. This might remind some of the infamous Greenwich Townhouse Bombing, where Weatherman lost two members to a faulty explosive, prompting them to end targeted bombing campaigns against human targets. Terra Lliure will not take the same oath, and continues its violent campaign against the Spanish state and forces which they deem reactionary. Bombings, mortar strikes on police stations and military bases, kidnappings, extortion, and punishment shootings are some of the actions they carry out during their 17 year existence (1978-1995). The most high-profile attack (at least internationally, I don't like historical editorialization, but in terms of wider attention it is the most remarked upon) was the bombing of Bar Iruna, a USO club catering to American Navy sailors. One American was killed and nine others were injured. This event - along with the bombing of an American consulate a few months before - suggests that these Catalan groups were also entrenched in anti-Imperialistic practices like those espoused by other violent groups during the New Left period. Responsibility for the attack was claimed by both Terra Lliure and the ERCA. Weirdly, at the time of the attack the Spanish police forces doubted the ERCA's claim, but in subsequent texts that deal with both groups the death is attributed to the ERCA, and not included in the statistics assigned to Terra Lliure.

The ERCA were a left wing militant group with aims similar to Terra Lliure, and would often work with the aforementioned group in efforts to bomb American targets, as well as Spanish police infrastructure. Aside from the USO bombing, the ERCA was responsible for a car bomb earlier in 1987 which resulted in the death of a police officer. They were formed in the wake of 1968's civil unrest, but were effectively disbanded in 1993.

In short, the Catalan movement has been "peaceful" only insofar as they are being compared to one of the most prolific and organized domestic/political groups of the 20th Century. There were several small militant organizations fighting for independence or some form of stronger self-determination.